Small Arms Review
  • Home
  • Articles
    • Guns & Parts
    • Suppressors
    • Optics & Thermals
    • Ammunition
    • Gear
    • News & Opinion
    • Columns
    • Museums & Factory Tours
    • ID Guides
    • Interviews
    • Event Coverage
    • Articles by Issue
      • Volume 1
        • V1N1 (Oct 1997)
        • V1N2 (Nov 1997)
        • V1N3 (Dec 1997)
        • V1N4 (Jan 1998)
        • V1N5 (Feb 1998)
        • V1N6 (Mar 1998)
        • V1N7 (Apr 1998)
        • V1N8 (May 1998)
        • V1N9 (Jun 1998)
        • V1N10 (Jul 1998)
        • V1N11 (Aug 1998)
        • V1N12 (Sep 1998)
      • Volume 2
        • V2N1 (Oct 1998)
        • V2N2 (Nov 1998)
        • V2N3 (Dec 1998)
        • V2N4 (Jan 1999)
        • V2N5 (Feb 1999)
        • V2N6 (Mar 1999)
        • V2N7 (Apr 1999)
        • V2N8 (May 1999)
        • V2N9 (Jun 1999)
        • V2N10 (Jul 1999)
        • V2N11 (Aug 1999)
        • V2N12 (Sep 1999)
      • Volume 3
        • V3N1 (Oct 1999)
        • V3N2 (Nov 1999)
        • V3N3 (Dec 1999)
        • V3N4 (Jan 2000)
        • V3N5 (Feb 2000)
        • V3N6 (Mar 2000)
        • V3N7 (Apr 2000)
        • V3N8 (May 2000)
        • V3N9 (Jun 2000)
        • V3N10 (Jul 2000)
        • V3N11 (Aug 2000)
        • V3N12 (Sep 2000)
      • Volume 4
        • V4N1 (Oct 2000)
        • V4N2 (Nov 2000)
        • V4N3 (Dec 2000)
        • V4N4 (Jan 2001)
        • V4N5 (Feb 2001)
        • V4N6 (Mar 2001)
        • V4N7 (Apr 2001)
        • V4N8 (May 2001)
        • V4N9 (Jun 2001)
        • V4N10 (Jul 2001)
        • V4N11 (Aug 2001)
        • V4N12 (Sep 2001)
      • Volume 5
        • V5N1 (Oct 2001)
        • V5N2 (Nov 2001)
        • V5N3 (Dec 2001)
        • V5N4 (Jan 2002)
        • V5N5 (Feb 2002)
        • V5N6 (Mar 2002)
        • V5N7 (Apr 2002)
        • V5N8 (May 2002)
        • V5N9 (Jun 2002)
        • V5N10 (Jul 2002)
        • V5N11 (Aug 2002)
        • V5N12 (Sep 2002)
      • Volume 6
        • V6N1 (Oct 2002)
        • V6N2 (Nov 2002)
        • V6N3 (Dec 2002)
        • V6N4 (Jan 2003)
        • V6N5 (Feb 2003)
        • V6N6 (Mar 2003)
        • V6N7 (Apr 2003)
        • V6N8 (May 2003)
        • V6N9 (Jun 2003)
        • V6N10 (Jul 2003)
        • V6N11 (Aug 2003)
        • V6N12 (Sep 2003)
      • Volume 7
        • V7N1 (Oct 2003)
        • V7N2 (Nov 2003)
        • V7N3 (Dec 2003)
        • V7N4 (Jan 2004)
        • V7N5 (Feb 2004)
        • V7N6 (Mar 2004)
        • V7N7 (Apr 2004)
        • V7N8 (May 2004)
        • V7N9 (Jun 2004)
        • V7N10 (Jul 2004)
        • V7N11 (Aug 2004)
        • V7N12 (Sep 2004)
      • Volume 8
        • V8N1 (Oct 2004)
        • V8N2 (Nov 2004)
        • V8N3 (Dec 2004)
        • V8N4 (Jan 2005)
        • V8N5 (Feb 2005)
        • V8N6 (Mar 2005)
        • V8N7 (Apr 2005)
        • V8N8 (May 2005)
        • V8N9 (Jun 2005)
        • V8N10 (Jul 2005)
        • V8N11 (Aug 2005)
        • V8N12 (Sep 2005)
      • Volume 9
        • V9N1 (Oct 2005)
        • V9N2 (Nov 2005)
        • V9N3 (Dec 2005)
        • V9N4 (Jan 2006)
        • V9N5 (Feb 2006)
        • V9N6 (Mar 2006)
        • V9N7 (Apr 2006)
        • V9N8 (May 2006)
        • V9N9 (Jun 2006)
        • V9N10 (Jul 2006)
        • V9N11 (Aug 2006)
        • V9N12 (Sep 2006)
      • Volume 10
        • V10N1 (Oct 2006)
        • V10N2 (Nov 2006)
        • V10N3 (Dec 2006)
        • V10N4 (Jan 2007)
        • V10N5 (Feb 2007)
        • V10N6 (Mar 2007)
        • V10N7 (Apr 2007)
        • V10N8 (May 2007)
        • V10N9 (Jun 2007)
        • V10N10 (Jul 2007)
        • V10N11 (Aug 2007)
        • V10N12 (Sep 2007)
      • Volume 11
        • V11N1 (Oct 2007)
        • V11N2 (Nov 2007)
        • V11N3 (Dec 2007)
        • V11N4 (Jan 2008)
        • V11N5 (Feb 2008)
        • V11N6 (Mar 2008)
        • V11N7 (Apr 2008)
        • V11N8 (May 2008)
        • V11N9 (Jun 2008)
        • V11N10 (Jul 2008)
        • V11N11 (Aug 2008)
        • V11N12 (Sep 2008)
      • Volume 12
        • V12N1 (Oct 2008)
        • V12N2 (Nov 2008)
        • V12N3 (Dec 2008)
        • V12N4 (Jan 2009)
        • V12N5 (Feb 2009)
        • V12N6 (Mar 2009)
        • V12N7 (Apr 2009)
        • V12N8 (May 2009)
        • V12N9 (Jun 2009)
        • V12N10 (Jul 2009)
        • V12N11 (Aug 2009)
        • V12N12 (Sep 2009)
      • Volume 13
        • V13N1 (Oct 2009)
        • V13N2 (Nov 2009)
        • V13N3 (Dec 2009)
        • V13N4 (Jan 2010)
        • V13N5 (Feb 2010)
        • V13N6 (Mar 2010)
        • V13N7 (Apr 2010)
        • V13N8 (May 2010)
        • V13N9 (Jun 2010)
        • V13N10 (Jul 2010)
        • V13N11 (Aug 2010)
        • V13N12 (Sep 2010)
      • Volume 14
        • V14N1 (Oct 2010)
        • V14N2 (Nov 2010)
        • V14N3 (Dec 2010)
          • Ammunition
        • V14N4 (Jan 2011)
        • V14N5 (Feb 2011)
        • V14N6 (Mar 2011)
        • V14N7 (Apr 2011)
        • V14N8 (May 2011)
        • V14N9 (Jun 2011)
        • V14N10 (Jul 2011)
        • V14N11 (Aug 2011)
        • V14N12 (Sep 2011)
      • Volume 15
        • V15N1 (Oct 2011)
        • V15N2 (Nov 2011)
        • V15N4 (Jan 2012)
        • V15N5 (Feb 2012)
      • Volume 16
        • V16N1 (1st Quarter 2012)
        • V16N2 (2nd Quarter 2012)
        • V16N3 (3rd Quarter 2012)
        • V16N4 (4th Quarter 2012)
      • Volume 17
        • V17N1 (1st Quarter 2013)
        • V17N2 (2nd Quarter 2013)
        • V17N3 (3rd Quarter 2013)
        • V17N4 (4th Quarter 2013)
      • Volume 18
        • V18N1 (Jan Feb 2014)
        • V18N2 (Mar Apr 2014)
        • V18N3 (May Jun 2014)
        • V18N4 (Jul Aug 2014)
        • V18N5 (Sep Oct 2014)
        • V18N6 (Nov Dec 2014)
      • Volume 19
        • V19N1 (Jan 2015)
        • V19N2 (Feb Mar 2015)
        • V19N3 (Apr 2015)
        • V19N4 (May 2015)
        • V19N5 (Jun 2015)
        • V19N6 (Jul 2015)
        • V19N7 (Aug Sep 2015)
        • V19N8 (Oct 2015)
        • V19N9 (Nov 2015)
        • V19N10 (Dec 2015)
      • Volume 20
        • V20N1 (Jan 2016)
        • V20N2 (Feb Mar 2016)
        • V20N3 (Apr 2016)
        • V20N4 (May 2016)
        • V20N5 (Jun 2016)
        • V20N6 (Jul 2016)
        • V20N7 (Aug Sep 2016)
        • V20N8 (Oct 2016)
        • V20N9 (Nov 2016)
        • V20N10 (Dec 2016)
      • Volume 21
        • V21N1 (Jan 2017)
        • V21N2 (Feb Mar 2017)
        • V21N3 (Apr 2017)
        • V21N4 (May 2017)
        • V21N5 (Jun 2017)
        • V21N6 (Jul 2017)
        • V21N7 (Aug Sep 2017)
        • V21N8 (Oct 2017)
        • V21N9 (Nov 2017)
        • V21N10 (Dec 2017)
      • Volume 22
        • V22N1 (Jan 2018)
        • V22N2 (Feb 2018)
        • V22N3 (March 2018)
        • V22N4 (Apr 2018)
        • V22N5 (May 2018)
        • V22N6 (Jun Jul 2018)
        • V22N7 (Aug Sep 2018)
        • V22N8 (Oct 2018)
        • V22N9 (Nov 2018)
        • V22N10 (Dec 2018)
      • Volume 23
        • V23N1 (Jan 2019)
        • V23N2 (Feb 2019)
        • V23N3 (Mar 2019)
        • V23N4 (Apr 2019)
        • V23N5 (May 2019)
        • V23N6 (Jun Jul 2019)
        • V23N7 (Aug Sep 2019)
        • V23N8 (Oct 2019)
        • V23N9 (Nov 2019)
        • V23N10 (Dec 2019)
      • Volume 24
        • V24N1 (Jan 2020)
        • V24N2 (Feb 2020)
        • V24N3 (Mar 2020)
        • V24N4 (Apr 2020)
        • V24N5 (May 2020)
        • V24N6 (Jun Jul 2020)
        • V24N7 (Aug Sep 2020)
        • V24N8 (Oct 2020)
        • V24N9 (Nov 2020)
        • V24N10 (Dec 2020)
  • The Archive
    • Search The Archive
  • Store
    • Books
    • Back Issues
    • Merchandise
  • Events
  • About
    • About Small Arms Review
    • About Chipotle Publishing
    • Contact Us
    • Other Publications
      • Small Arms Defense Journal
  • Home
  • Articles
    • Guns & Parts
    • Suppressors
    • Optics & Thermals
    • Ammunition
    • Gear
    • News & Opinion
    • Columns
    • Museums & Factory Tours
    • ID Guides
    • Interviews
    • Event Coverage
    • Articles by Issue
      • Volume 1
        • V1N1 (Oct 1997)
        • V1N2 (Nov 1997)
        • V1N3 (Dec 1997)
        • V1N4 (Jan 1998)
        • V1N5 (Feb 1998)
        • V1N6 (Mar 1998)
        • V1N7 (Apr 1998)
        • V1N8 (May 1998)
        • V1N9 (Jun 1998)
        • V1N10 (Jul 1998)
        • V1N11 (Aug 1998)
        • V1N12 (Sep 1998)
      • Volume 2
        • V2N1 (Oct 1998)
        • V2N2 (Nov 1998)
        • V2N3 (Dec 1998)
        • V2N4 (Jan 1999)
        • V2N5 (Feb 1999)
        • V2N6 (Mar 1999)
        • V2N7 (Apr 1999)
        • V2N8 (May 1999)
        • V2N9 (Jun 1999)
        • V2N10 (Jul 1999)
        • V2N11 (Aug 1999)
        • V2N12 (Sep 1999)
      • Volume 3
        • V3N1 (Oct 1999)
        • V3N2 (Nov 1999)
        • V3N3 (Dec 1999)
        • V3N4 (Jan 2000)
        • V3N5 (Feb 2000)
        • V3N6 (Mar 2000)
        • V3N7 (Apr 2000)
        • V3N8 (May 2000)
        • V3N9 (Jun 2000)
        • V3N10 (Jul 2000)
        • V3N11 (Aug 2000)
        • V3N12 (Sep 2000)
      • Volume 4
        • V4N1 (Oct 2000)
        • V4N2 (Nov 2000)
        • V4N3 (Dec 2000)
        • V4N4 (Jan 2001)
        • V4N5 (Feb 2001)
        • V4N6 (Mar 2001)
        • V4N7 (Apr 2001)
        • V4N8 (May 2001)
        • V4N9 (Jun 2001)
        • V4N10 (Jul 2001)
        • V4N11 (Aug 2001)
        • V4N12 (Sep 2001)
      • Volume 5
        • V5N1 (Oct 2001)
        • V5N2 (Nov 2001)
        • V5N3 (Dec 2001)
        • V5N4 (Jan 2002)
        • V5N5 (Feb 2002)
        • V5N6 (Mar 2002)
        • V5N7 (Apr 2002)
        • V5N8 (May 2002)
        • V5N9 (Jun 2002)
        • V5N10 (Jul 2002)
        • V5N11 (Aug 2002)
        • V5N12 (Sep 2002)
      • Volume 6
        • V6N1 (Oct 2002)
        • V6N2 (Nov 2002)
        • V6N3 (Dec 2002)
        • V6N4 (Jan 2003)
        • V6N5 (Feb 2003)
        • V6N6 (Mar 2003)
        • V6N7 (Apr 2003)
        • V6N8 (May 2003)
        • V6N9 (Jun 2003)
        • V6N10 (Jul 2003)
        • V6N11 (Aug 2003)
        • V6N12 (Sep 2003)
      • Volume 7
        • V7N1 (Oct 2003)
        • V7N2 (Nov 2003)
        • V7N3 (Dec 2003)
        • V7N4 (Jan 2004)
        • V7N5 (Feb 2004)
        • V7N6 (Mar 2004)
        • V7N7 (Apr 2004)
        • V7N8 (May 2004)
        • V7N9 (Jun 2004)
        • V7N10 (Jul 2004)
        • V7N11 (Aug 2004)
        • V7N12 (Sep 2004)
      • Volume 8
        • V8N1 (Oct 2004)
        • V8N2 (Nov 2004)
        • V8N3 (Dec 2004)
        • V8N4 (Jan 2005)
        • V8N5 (Feb 2005)
        • V8N6 (Mar 2005)
        • V8N7 (Apr 2005)
        • V8N8 (May 2005)
        • V8N9 (Jun 2005)
        • V8N10 (Jul 2005)
        • V8N11 (Aug 2005)
        • V8N12 (Sep 2005)
      • Volume 9
        • V9N1 (Oct 2005)
        • V9N2 (Nov 2005)
        • V9N3 (Dec 2005)
        • V9N4 (Jan 2006)
        • V9N5 (Feb 2006)
        • V9N6 (Mar 2006)
        • V9N7 (Apr 2006)
        • V9N8 (May 2006)
        • V9N9 (Jun 2006)
        • V9N10 (Jul 2006)
        • V9N11 (Aug 2006)
        • V9N12 (Sep 2006)
      • Volume 10
        • V10N1 (Oct 2006)
        • V10N2 (Nov 2006)
        • V10N3 (Dec 2006)
        • V10N4 (Jan 2007)
        • V10N5 (Feb 2007)
        • V10N6 (Mar 2007)
        • V10N7 (Apr 2007)
        • V10N8 (May 2007)
        • V10N9 (Jun 2007)
        • V10N10 (Jul 2007)
        • V10N11 (Aug 2007)
        • V10N12 (Sep 2007)
      • Volume 11
        • V11N1 (Oct 2007)
        • V11N2 (Nov 2007)
        • V11N3 (Dec 2007)
        • V11N4 (Jan 2008)
        • V11N5 (Feb 2008)
        • V11N6 (Mar 2008)
        • V11N7 (Apr 2008)
        • V11N8 (May 2008)
        • V11N9 (Jun 2008)
        • V11N10 (Jul 2008)
        • V11N11 (Aug 2008)
        • V11N12 (Sep 2008)
      • Volume 12
        • V12N1 (Oct 2008)
        • V12N2 (Nov 2008)
        • V12N3 (Dec 2008)
        • V12N4 (Jan 2009)
        • V12N5 (Feb 2009)
        • V12N6 (Mar 2009)
        • V12N7 (Apr 2009)
        • V12N8 (May 2009)
        • V12N9 (Jun 2009)
        • V12N10 (Jul 2009)
        • V12N11 (Aug 2009)
        • V12N12 (Sep 2009)
      • Volume 13
        • V13N1 (Oct 2009)
        • V13N2 (Nov 2009)
        • V13N3 (Dec 2009)
        • V13N4 (Jan 2010)
        • V13N5 (Feb 2010)
        • V13N6 (Mar 2010)
        • V13N7 (Apr 2010)
        • V13N8 (May 2010)
        • V13N9 (Jun 2010)
        • V13N10 (Jul 2010)
        • V13N11 (Aug 2010)
        • V13N12 (Sep 2010)
      • Volume 14
        • V14N1 (Oct 2010)
        • V14N2 (Nov 2010)
        • V14N3 (Dec 2010)
          • Ammunition
        • V14N4 (Jan 2011)
        • V14N5 (Feb 2011)
        • V14N6 (Mar 2011)
        • V14N7 (Apr 2011)
        • V14N8 (May 2011)
        • V14N9 (Jun 2011)
        • V14N10 (Jul 2011)
        • V14N11 (Aug 2011)
        • V14N12 (Sep 2011)
      • Volume 15
        • V15N1 (Oct 2011)
        • V15N2 (Nov 2011)
        • V15N4 (Jan 2012)
        • V15N5 (Feb 2012)
      • Volume 16
        • V16N1 (1st Quarter 2012)
        • V16N2 (2nd Quarter 2012)
        • V16N3 (3rd Quarter 2012)
        • V16N4 (4th Quarter 2012)
      • Volume 17
        • V17N1 (1st Quarter 2013)
        • V17N2 (2nd Quarter 2013)
        • V17N3 (3rd Quarter 2013)
        • V17N4 (4th Quarter 2013)
      • Volume 18
        • V18N1 (Jan Feb 2014)
        • V18N2 (Mar Apr 2014)
        • V18N3 (May Jun 2014)
        • V18N4 (Jul Aug 2014)
        • V18N5 (Sep Oct 2014)
        • V18N6 (Nov Dec 2014)
      • Volume 19
        • V19N1 (Jan 2015)
        • V19N2 (Feb Mar 2015)
        • V19N3 (Apr 2015)
        • V19N4 (May 2015)
        • V19N5 (Jun 2015)
        • V19N6 (Jul 2015)
        • V19N7 (Aug Sep 2015)
        • V19N8 (Oct 2015)
        • V19N9 (Nov 2015)
        • V19N10 (Dec 2015)
      • Volume 20
        • V20N1 (Jan 2016)
        • V20N2 (Feb Mar 2016)
        • V20N3 (Apr 2016)
        • V20N4 (May 2016)
        • V20N5 (Jun 2016)
        • V20N6 (Jul 2016)
        • V20N7 (Aug Sep 2016)
        • V20N8 (Oct 2016)
        • V20N9 (Nov 2016)
        • V20N10 (Dec 2016)
      • Volume 21
        • V21N1 (Jan 2017)
        • V21N2 (Feb Mar 2017)
        • V21N3 (Apr 2017)
        • V21N4 (May 2017)
        • V21N5 (Jun 2017)
        • V21N6 (Jul 2017)
        • V21N7 (Aug Sep 2017)
        • V21N8 (Oct 2017)
        • V21N9 (Nov 2017)
        • V21N10 (Dec 2017)
      • Volume 22
        • V22N1 (Jan 2018)
        • V22N2 (Feb 2018)
        • V22N3 (March 2018)
        • V22N4 (Apr 2018)
        • V22N5 (May 2018)
        • V22N6 (Jun Jul 2018)
        • V22N7 (Aug Sep 2018)
        • V22N8 (Oct 2018)
        • V22N9 (Nov 2018)
        • V22N10 (Dec 2018)
      • Volume 23
        • V23N1 (Jan 2019)
        • V23N2 (Feb 2019)
        • V23N3 (Mar 2019)
        • V23N4 (Apr 2019)
        • V23N5 (May 2019)
        • V23N6 (Jun Jul 2019)
        • V23N7 (Aug Sep 2019)
        • V23N8 (Oct 2019)
        • V23N9 (Nov 2019)
        • V23N10 (Dec 2019)
      • Volume 24
        • V24N1 (Jan 2020)
        • V24N2 (Feb 2020)
        • V24N3 (Mar 2020)
        • V24N4 (Apr 2020)
        • V24N5 (May 2020)
        • V24N6 (Jun Jul 2020)
        • V24N7 (Aug Sep 2020)
        • V24N8 (Oct 2020)
        • V24N9 (Nov 2020)
        • V24N10 (Dec 2020)
  • The Archive
    • Search The Archive
  • Store
    • Books
    • Back Issues
    • Merchandise
  • Events
  • About
    • About Small Arms Review
    • About Chipotle Publishing
    • Contact Us
    • Other Publications
      • Small Arms Defense Journal
No Result
View All Result
Small Arms Review
No Result
View All Result
Home Guns & Parts

2018 Frankengun Challenge

by SAR Staff
November 1, 2018
in Guns & Parts, Articles, Articles by Issue, Collecting, Search by Issue, V22N9 (Nov 2018), Volume 22
2018 Frankengun Challenge
Share on FacebookShare on Twitter

By The Small Arms Review Editorial Staff

What is a “Frankengun”?

A “Frankengun” is just what it sounds like—a cross between Frankenstein’s Monster and a gun, in this case a machine gun. The phrase goes back to the early Internet days when legal machine gun owners would cross-pollinate weapon designs using parts, and sometimes movie voodoo type add-ons, to create something that fit their idea of a fun gun. Frankengun contests are held occasionally, and we at Small Arms Review like to encourage our readers to participate, making sure it’s legal as they do so. Much like our fabled “MacWaffle” contest (Small Arms Review Vol. 2, No. 4), where readers had to make a working waffle iron out of MAC flats, this is about having some fun.

We received several entries but chose the top 2 presented here. The winner of the Frankengun Challenge will be judged by the readers and receive a 3-year subscription to both Small Arms Review and Small Arms Defense Journal. An RKI Certificate will be provided for those who put in an entry, which will be suitable for framing.

An MK760 with a BWE Swedish ìKî magazine conversion that allows you to use unmodified Suomi stick, drum and coffin magazines. It is also outfitted with BWEís AR-15 stock, grip and forend adapters and a red dot sight.

The S&W76/MK760

Magazine Problems Forced Owner to do Some Surgery

Richard Hoffman

This project started when one of my friends purchased an MK760 that was jamming. The gun would run just fine if you held the magazine forward and did not let it move when you shot it. The magazine well on his MK760 was too large and would let the magazine flop all over the place. The rounds would never be presented the same way consistently, causing feed jams. Looking at it and the history of the Smith & Wesson 76 / MK760, it should have always been designed like the Swedish “K” and been able to accept Suomi sticks, drums and coffin magazines. So I went to work.

Not knowing beyond a shadow of a doubt that I could get the drum magazines to work without having to cut too much out of the receiver and weakening it, I decided the best course of action would be to make a post sample 760 receiver to convert and work out all the bugs. I started by first carefully cutting off the magazine well so I could use it later. I then milled enough of the receiver away from the magazine cutout to allow the Suomi drum magazine to sit high enough to feed. The front magazine block was the next part to design, machine and weld into place. The next parts needed were a rear filler block to hold the rear rib of the magazine and a new magazine catch. At this point it was running perfectly with the double-feed magazines, but the bolt was too wide at the bottom and would hit the back of the single-feed magazines. The next job was to machine a new bolt that was narrower on the bottom so it would feed from the single-feed magazines and the double-feed stick magazines like the Swedish “K.” After all this, it worked and worked really well. I hope by the time this article is published I will have everything designed, machined and ready to start accepting guns in for the magazine conversion.

BWEís AR-15 stock and grip adapters allow you to use your favorite AR-15 stock and grip on your Smith & Wesson 76 or MK760.

Last fall I had the opportunity to pick up an S&W76 for a good price and jumped on it since I have started to make replacement parts for the S&W76 /MK760 SMGs and wanted good parts to copy. I was excited and decided to shoot it in one of our monthly Florida subgun matches. The whole time I shot the match I was fighting to keep the stock from folding up on me. I tried using one of the existing AR-15 stock adapters on it and had problems with not being able to get everything to stay tight so the stock would twist in the adapter. I was not happy with that at all, so I designed a solid AR-15 stock adapter that I was happy with.

Now that I wasn’t using the factory stock, why not make a grip adapter to use on one of the many AR-15 grips that are available on the market? The grip adapter was fairly easy to design, but with all the angled sides that had to be machined, this proved to be more of a challenge than I was anticipating. After updating my version of BobCad, my cadcam program, and figuring out a fixture for my fourth axis on my CNC machining center, I was able to turn them out in a reasonable amount of time. The hardest part of the grip adapter was figuring the best way to make the captive mounting screw.

Monolith from the left side. From front to rear, Elite Iron 7.62 suppressor with Manta suppressor cover, INFORCE weapon light. X Products skeletonized X-15 drum mag, Nikon P-Tactical reflex sight, Magpul MOE pistol grip, Radian Raptor charging handle and Rogers Superstock butt stock. The M4 6520 lower receiver came from Colt with the MOE grip and Rogers stock. The upper is Coltís 10.5in-barreled 6945 Monolith, with Colt-supplied Magpul MBUS rear sight. The Sling is a Vickers Tactical from Blue Force Gear.

With the stock and grip taken care of I now had the problem of sights/optics. The AR-15 stock makes you look over the top of the factory sights, and I wanted to use a red dot sight on it anyway. I tried a clamp-on optic rail my friend had, but it would twist side to side and slide forward and back. At this point I decided to weld a short section of rail to the receiver which worked really well, but I figured a lot of people would not want to weld a rail to the top of their transferable. I decided since I had so much AR-15 furniture on it already, I might as well go all the way and make a barrel nut that would let me mount an AR-15 forend on it. I installed a Midwest Industries 8-inch Slim M-Lok forend. I then mounted a FastFire 2 red dot sight with the FastFire AR mount on the forend.

I usually don’t like bolting on all the AR-15 furniture on a non-AR-15, but it has made this 760 shoot really well. It has now become my favorite competition subgun. There is very little rise while shooting long bursts while neutralizing a plate rack or a Polish plate rack. It is extremely easy to keep on target and is extremely accurate. More than that, it makes the 76/760 a very enjoyable subgun to shoot.

Along the way I made machined and heat-treated A2 tool steel extractors, solid stainless steel recoil spring guides and a 3/32-thick heavy duty neoprene buffer to ease any hammering of the takedown pin from the bolt. In the near future I will be adding a little bit of weight to the bolt to slow it down—about 100 RPM. I am also planning on designing a good folding stock as well as a fixed stock that will allow you to use the factory sights. I think a 22LR kit for the 76/760 would be a whole lot of fun. This is an ongoing project until I get the S&W76/MK760 to be the best subgun match gun out there. I also want to get all the S&W76/MK760s out of the back of people’s safes and to the range doing what they should be doing.

This right front æ view highlights the Manta very comfortable rail covers, as adopted by the USMC for the M27 IAR. The front sight is integral to the Monolith upper receiver.

The Monolith: Living the Dream with my Favorite Thing

Walt Kuleck

Waiting a year (less a day) for the tax stamp on my Colt M4 (LE6520) to come back from the ATF gave me a lot of time to consider what to do with the lower when it became a legal SBR. When I submitted the Form 1 I had planned to create a true M4 with a 14.5-inch Colt upper; however, that seemed to be a bit mundane. So, I began to cast about for alternatives, with the desire to remain in the Colt universe.

I had done some familiarization training with our city’s SWAT team, introducing them to their 11.5-inch Colt Commandos. Thus, the thought of creating a Commando with a Colt law enforcement upper came to mind. While searching various suppliers to nail down one of those 11.5-inch uppers, I came across a 10.5-inch Colt Monolithic upper, LE6945CK. That struck me as the perfect complement to the now-SBR M4 lower.

In the process of writing a number of books on the AR platform, I had formed some ideas as to the appropriate configuration for my 6945 SBR. I chose a Geissele trigger and a flat-wire buffer spring and heavy buffer for the lower’s internals. Externally, I installed a Nikon reflex sight and INFORCE weapon light. I particularly like the INFORCE light because it can be operated conveniently without the trouble of wires and remote switches.

This left-side close-up highlights the Manta suppressor cover on the Elite Iron suppressor and the INFORCE weapon light. The Manta cover remains cool enough to handle even after three 30-round mag dumps on full-auto, to which I can attest from personal experience. The integral switch of the INFORCE light makes it easy to activate without the trouble of external wires and switch pads.

Up front I screwed on an Elite Iron can. To protect tender flesh, clothing and equipment from a hot suppressor, I covered the can with a Manta suppressor sleeve. Manta’s polymer allows safely grasping the suppressor even after multiple mag dumps. Manta supplies rail covers to the USMC for their M27 automatic rifle; I have come to appreciate the Manta rail covers, so they were a natural choice for the project. A Vickers sling from Blue Force Gear shoulders the load.

Finally, I have become quite fond of X Products’ drum mags, so an X-15 was the natural choice for a high-capacity feeding device. The skeletonized version may not be the most practical in a dusty or muddy environment; it saves a little weight and, well, looks cool.

So, there you have it; a year-long dream, culminating in the opportunity to bring together some of my favorite things from Geissele, INFORCE, Manta, X Products and others. “The Monolith,” as I call it, is a fun piece and one of my all-time favorites.

Frankengun Captions

BWE-76-1: Pictured is an MK760 with a BWE Swedish “K” magazine conversion that allows you to use unmodified Suomi stick, drum and coffin magazines. It is also outfitted with BWE’s AR-15 stock, grip and forend adapters and a red dot sight.

BWE-76-3: BWE’s AR-15 stock and grip adapters allow you to use your favorite AR-15 stock and grip on your Smith & Wesson 76 or MK760.

WJKuleck SBR Left Side 2

Monolith from the left side. From front to rear, Elite Iron 7.62 suppressor with Manta suppressor cover, INFORCE weapon light. X Products skeletonized X-15 drum mag, Nikon P-Tactical reflex sight, Magpul MOE pistol grip, Radian Raptor charging handle and Rogers Superstock butt stock. The M4 6520 lower receiver came from Colt with the MOE grip and Rogers stock. The upper is Colt’s 10.5in-barreled 6945 Monolith, with Colt-supplied Magpul MBUS rear sight. The Sling is a Vickers Tactical from Blue Force Gear.

This upper front left æ view highlights the folded integral front sight and the Manta rail covers. At the rear the Nikon P-Tactical reflex sight is on a UTG riser for center co-witness. The knob on the top of the INFORCE weapon sight is the tensioning screw for the sightís integral rail mount.

WJKuleck SBR Right Side Monolith

This right front ¾ view highlights the Manta very comfortable rail covers, as adopted by the USMC for the M27 IAR. The front sight is integral to the Monolith upper receiver.

WJKuleck Left Side Manta

This left-side close-up highlights the Manta suppressor cover on the Elite Iron suppressor and the INFORCE weapon light. The Manta cover remains cool enough to handle even after three 30-round mag dumps on full-auto, to which I can attest from personal experience. The integral switch of the INFORCE light makes it easy to activate without the trouble of external wires and switch pads.

WJKuleck SBR Left Side INFORCE

This upper front left ¾ view highlights the folded integral front sight and the Manta rail covers. At the rear the Nikon P-Tactical reflex sight is on a UTG riser for center co-witness. The knob on the top of the INFORCE weapon sight is the tensioning screw for the sight’s integral rail mount.

This article first appeared in Small Arms Review V22N9 (November 2018)

Tags: 20182018 Frankengun ChallengeMagazine Problems Forced Owner to do Some SurgeryNOVEMBER 2018Richard HoffmanSmall Arms Review Editorial StaffThe S&W76/MK760V22N9What is a “Frankengun”?
Previous Post

NFATCA Report: October 2018

Next Post

New Review: V23N1

Next Post
New Review: V19N1

New Review: V23N1

TRENDING STORIES

  • VALKYRIE ARMAMENT BELT-FED CONVERSION

    VALKYRIE ARMAMENT BELT-FED CONVERSION

    0 shares
    Share 0 Tweet 0
  • EAST GERMAN WIEGER STG RIFLE

    0 shares
    Share 0 Tweet 0
  • The Complete Guide To Colt M-16 Models: Part I

    0 shares
    Share 0 Tweet 0
  • Forgotten M16A1 Rifle Manufacturers: GM/Hydra-Matic and Harrington & Richardson – Part I

    0 shares
    Share 0 Tweet 0
  • The Second Generation AR57: Drop-in 5.7 Upper For Your AR

    0 shares
    Share 0 Tweet 0

RECENT POSTS

SIG Sauer’s Full-Size Compact P365 “Fuse”

SIG Sauer’s Full-Size Compact P365 “Fuse”

June 27, 2024
The Importance of Offhand Shooting

The Importance of Offhand Shooting

June 25, 2024
BOOK REVIEW – The Collector’s Guide to the SKS

BOOK REVIEW – The Collector’s Guide to the SKS

June 20, 2024
True to Form: The Tisas 1911A1 ASF

True to Form: The Tisas 1911A1 ASF

June 18, 2024
Setting the Record Straight on the Fedorov Avtomat

Setting the Record Straight on the Fedorov Avtomat

June 6, 2024

QUICK LINKS

  • About Chipotle Publishing
  • About Small Arms Review
  • Advertise with Us
  • Write for Us

CONTACT DETAILS

  • Phone: +1 (702) 565-0746
  • E-mail: office@smallarmsreview.com
  • Web: www.chipotlepublishing.com
  • Chipotle Publishing, LLC 631 N. Stephanie St., No. 282, Henderson, NV 89014
Small Arms Review

FOLLOW US

  • Privacy Policy
  • Disclaimer

© 2022 Chipotle Publishing | All Rights Reserved

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In

Add New Playlist

No Result
View All Result
  • Home
  • Articles
    • Guns & Parts
    • Suppressors
    • Optics & Thermals
    • Ammunition
    • Gear
    • News & Opinion
    • Columns
    • Museums & Factory Tours
    • ID Guides
    • Interviews
    • Event Coverage
    • Articles by Issue
      • Volume 1
      • Volume 2
      • Volume 3
      • Volume 4
      • Volume 5
      • Volume 6
      • Volume 7
      • Volume 8
      • Volume 9
      • Volume 10
      • Volume 11
      • Volume 12
      • Volume 13
      • Volume 14
      • Volume 15
      • Volume 16
      • Volume 17
      • Volume 18
      • Volume 19
      • Volume 20
      • Volume 21
      • Volume 22
      • Volume 23
      • Volume 24
  • The Archive
    • Search The Archive
  • Store
    • Books
    • Back Issues
    • Merchandise
  • Events
  • About
    • About Small Arms Review
    • About Chipotle Publishing
    • Contact Us
    • Other Publications
      • Small Arms Defense Journal

© 2022 Chipotle Publishing | All Rights Reserved

This website uses cookies. By continuing to use this website you are giving consent to cookies being used. Visit our Privacy and Cookie Policy.

Redirecting to External Website

You are leaving the Small Arms Review website and will be redirected to an external link in a 5 Seconds.
VISIT NOW!