Abstract: A device for retaining cartridges in a tubular magazine of a semi-automatic shotgun when the cartridge in the firing chamber is being replaced, comprising a spring-loaded catch lever which is pivoted to the gun about a transverse axis, so as to be angularly displaceable between an inoperative position allowing the discharge of cartridges from the magazine, and an operative position blocking the discharge of cartridges from the magazine. The lever is displaced manually into its operative position and is held in this position by the action of the magazine spring until the gun is fired, whereupon the recoil causes the automatic release of the lever to its inoperative position.

Abstract: A shot-gun with gas take-off has a fore end stock which is movable longitudinally of the barrel and lockable selectively in each of two positions: in one position gases from the discharge of a cartridge in the gun bleed from the barrel into the chamber of a piston/cylinder unit to drive the piston to operate an arming rod of the shot gun automatically. In the other position, a valve member prevents the discharge gases from entering the cylinder chamber, these gases being vented to the external environment: the stock is rigidly locked to the piston for manual operation of the arming rod by "pump" action on the stock in the latter position.

Abstract: A safety device for the trigger mechanism of a gas-operated-automatic/pump-action-manual shot-gun comprises an over-center thrust spring assembly pivotally connected at one end to a fixed point on the gun and at the other end to a stop member defining lever. The thrust spring assembly is pivotable between a first position, in which it biases the said lever into an operative position, bearing against the breechblock carrier, and a second position in which it stabilizes the said lever in an inoperative position, out of the path of movement of the breechblock carrier, preventing rebound of the stop member defining lever into the said path.