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Home Firearm History

Ahead of Its Time: British Fosbery Pump-Action Shotgun with “Stoner” Bolt

SAR Staff by SAR Staff
February 19, 2023
in Firearm History, Articles, Articles by Issue, Search by Issue, V22N9 (Nov 2018), Volume 22
Ahead of Its Time: British Fosbery Pump-Action Shotgun with “Stoner” Bolt

The Fosbery pump-action shotgun with "Stoner"-style bolt. (Jonathan Ferguson/ARES)

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By Jonathan Ferguson
Armament Research Services (ARES)

George Fosbery is best remembered for his Webley-Fosbery “Automatic” (self-cocking) revolver and his “Paradox” shotgun rifling system. He arguably also deserves credit for one of the most significant firearms design elements in history; the multi-lugged rotating bolt with integral claw extractor and plunger ejector. This is usually credited to Eugene Stoner as part of his revolutionary design for the ArmaLite AR-10 (1956), which of course evolved into the ubiquitous and important AR-15 pattern, but in actuality, Stoner borrowed from Melvin Johnson’s 1941 rifle bolt. This bolt and barrel extension solution allows for a consistent and accurate lock-up and a lightweight receiver, since the extension and bolt bear the pressure of firing and no additional locking surfaces or over-building are required. The vast majority of modern self-loading rifles utilize either this system or the AK twin-lugged bolt and trunnion approach.

Clearly in 1891, when Fosbery first patented this design, he was not anticipating today’s trends in rifle design, but it is intriguing that he arrived at the same solution to the problem of locking mechanisms as Johnson (1939) and Stoner (1956). Even more interestingly, whereas Johnson machined an ejector groove in his bolt (for a receiver-mounted ejector), Fosbery’s bolt has the later Stoner-type plunger ejector built into it. The designs are so similar that it is tempting to imagine the involvement of a DeLorean somewhere in the design process!

Fosberyís multi-lugged rotating bolt with integral claw extractor and plunger ejector. (Ian McCollum/Forgotten Weapons.com)

As an important caveat, it is quite possible that Stoner or Johnson never saw Fosbery’s patent or his gun. The two designs are not in fact identical, the Fosbery having six radial lugs, Johnson and Stoner opting for (effectively) seven. Fosbery also placed the extractor within a lug, rather than omitting that lug as modern Stoner bolts tend to. The lugs themselves also differ in profile, although there is a reason for this and another interesting historical ‘echo’ to note. In recent years, Knight’s Armament Corporation developed a radiused bolt lug profile similar to that seen in the original Fosbery bolt. This was done to meet a specific user requirement, whereas in the Fosbery it was likely done due to the inherent weakness of square lugs, given the metallurgy of the day. Fractured lugs are still a failure point today, albeit in extremis.

The breech-face of the Fosbery pump-action shotgun. (Jonathan Ferguson/ARES)

The gun itself is not well documented, and the present author has not been able to locate the relevant patent, which published references state was ‘No. 11,339’. Nor is it known when this example was constructed. Ian McCollum’s working theory is that it was built as a rifle and modified several times to serve as a testbed for different ideas. The trigger guard/magazine housing has been altered, and notably, the barrel has been replaced by a 1909-dated Winchester 16 bore shotgun barrel. What profile the original barrel might have had is not known, but the bolt and barrel extension are certainly scaled for a large cartridge. Clearly a magazine of some sort was originally fitted, but it is not clear how this would have functioned. The trigger mechanism intrudes into the space that would surely be required for a cartridge to feed.

Left-hand side of the receiver area of the Fosbery pump-action shotgun, with the action open. (Jonathan Ferguson/ARES)

In any case, the design came to nothing commercially and only two examples survive today. Pump-action shotguns did not catch on in the UK, and Fosbery’s bolt was never married to any of the several early self-loading designs then in existence. Indeed, this may not even have been practical at the time even if it had been thought of. Nor is there any evidence of military trials, which is not surprising if Fosbery thought of his bolt as a feature best applied to shotguns. The present-day reality is that such low pressure ammunition does not require such a stout and sophisticated mechanism. A simple tilting bolt acting in a locking shoulder is sufficient for most pump-operated designs.

Technical Specifications

Calibre: 16 bore
Overall length: 1273 mm (50.1”)
Barrel length: 773 mm (30.4″)
Weight (with empty magazine): 3.41 kg (7.5 lbs)
Feed device: Unknown

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

Tags: 2018Ahead of Its Time: British Fosbery Pump-Action Shotgun with “Stoner” BoltNOVEMBER 2018V22N9
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