The rear of the lower receiver was also the mounting point for a crude rear sight that could be adjusted to the 2-o’clock position for left-handed shooters or the 10-o’clock position for right-handed shooters. These USAF prototypes were made with a nickel-plated sheet-steel upper receiver and a solid-aluminum lower receiver that included a magazine housing for the weapon’s proprietary 30-round detachable-box magazine. It fired a 52-grain bullet at 2,500 fps and generated the kind of low-recoil impulse that would be needed to make the IMP singlehandedly controllable as per Air Force specifications.Ĭolloquially known as the IMP-221, the Air Force gave the weapon the official designation GUU-4/P. 221 Fireball was optimized specifically for shorter-length barrels by scaling down the. Developed for the Remington XP-100 bolt-action pistol in 1963, the. It was chambered for a still relatively new intermediate cartridge.
To make the IMP truly ambidextrous, the pistol grip/trigger-group assembly was given the freedom to cant 38 degrees to either side of the receiver. This “IMP” would be capable of delivering controllable full-auto fire and could therefore be used for both survival and combat.ĭale Davis, of the USAF Armament Laboratory, came up with a basic concept for a stockless, gas-operated bullpup pistol that could be fired with one hand by bracing the action against the shooter’s forearm and biceps. Toward that end, it entered into a contract with Colt’s Military Arms Division in 1968 to develop an Individual Multi-Purpose weapon. Although effective and reliable, the 608 was 29 inches long and weighed 4.7 pounds, and the Air Force wanted something even smaller and lighter. revolver was needed, so in 1964, a modified AR-15 carbine designated the Model 608 was briefly tested, but not adopted. Something possessing more firepower than a. 410-bore, it could not be used as an effective personal-defense weapon. Since 1952, the Air Force had been issuing the M6 Aircrew Survival Weapon but, because it was chambered in. (r.) The Arm Pistol came with a distinct muzzle brake to tame recoil and keep the. (r-ctr.) Sights are canted to either side, depending on the shooter’s dominant hand/eye. (l-ctr.) Along with the magazine and pistol grip, the safety- selector is the same as that found on the AR-15. (l.) Rotating immediately behind the rear of the lower receiver, the Arm Pistol looks unusual in use and was not well-received by firearm consumers.
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