Manville 12-Bore Gun
The original, 1935, steel-and-aluminum weapon held twenty-four rounds of 12-gauge × 2.75-inch (18.5×70mmR) shells in a spring-driven rotary-cylinder that had to be wound counter-clockwise before firing. It consisted of a steel barrel of 11.1 inches (280 mm), a rotating aluminum-alloy ammo cylinder, a single-piece steel body and foregrip, and wooden pistol grips.
Loading and unloading were effected by unscrewing two thick, large-headed knobbed screws at the top of the weapon's cylinder that allowed the disassembly of the weapon into two halves. The forend and cylinder were the front half and the pistol-grip and cylinder backplate were the back half.
The weapon's striker was engaged by rotating and then pushing in a knob at the back of the pistol grip (reversed to disengage it—rendering it safe). Each cylinder in the weapon had its own firing pin assembly. When the trigger is pulled the striker is cocked; when the trigger "breaks", the striker is released and hits the firing pin, firing the shell.
26.5mm Manville Machine-Projector
In 1936, Manville introduced a version that held eighteen rounds of 26.5mm (1-inch) bore shells. This design fired 26.5mm × 3.15 inch Short (26.5mm × 80mmR) flare, smoke, and riot gas shells. Explosive shells were not available and the cylinder walls are too thin for shot-shells. The weapon is similar to the earlier 12-gauge version, except the barrel was either 9.5 inches (240 mm) or 9.75 inches (248 mm), and used hard rubber rear grips instead of wood.
The First Model 26.5 was a larger-bore version of the 12-gauge shotgun, using the same two securing screws.
The Second Model 26.5 differed in that it used a long, thick metal locking bar with a turned-down bolt-handle, like the metal bolt on a bolt-action rifle, which locked into a recess machined into the frame. This slid through a round sleeve atop each half of the weapon to secure the two halves. When the bolt was unlatched and pulled to the rear, the back-plate was turned to the operator's right using the rear grip, allowing access to the cylinder. The operator could then pull out the spent shells and reload fresh ones.
Barrel and cylinder inserts were available to allow it to fire 12-gauge shells or clusters of .38 Special cartridges.
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