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Shooting from the hip is a lost art these days. They declared it to be as rare as a “bullpup,” and the moniker stuck. American ordnance specialists encountered this unusual buzz gun. The Model 2 nonetheless suffered terminal teething problems. Firing the standard bottlenecked 8mm Nambu round via a magazine feeding through the pistol grip, the gun was not philosophically unlike an Uzi. Japanese Naval Infantry employed very small numbers during World War II in the Pacific. The Japanese Experimental Model 2 was an odd though advanced design. The true origins of the term, however, seem to have stemmed from a rare Japanese submachine gun developed during World War II. The term “bullpup” began in the 1950s to describe any target pistol with particularly fancy grips. The earliest known example came with the ill-fated British Thorneycroft bolt-action rifle designed in the early 20th century. The Steyr AUG, the KelTec RFB, the FN F2000 and the Israeli Tavor are all successful examples of guns embodying this concept. The term “bullpup” now refers to any firearm with an action oriented behind the fire controls. Additionally, the only hope the IMP designers had of meeting the demanding size and weight restrictions of the USAF program was to utilize a bullpup action. The select-fire IMP-221 employed a novel mechanical rate reducer to keep its cyclic rate down to manageable levels. While dozens of manufacturers offer successful guns based upon this concept today, the IMP-221 seems to have been the first. The IMP-221 action reflected a remarkably effective melding of the elegant rotating bolt of the M16 with the robust long-stroke gas-operated system of the AK. It paved the way for the various dedicated PDW rounds in common use today. The gun’s 5.56x36mm round was 9mm shorter than a standard 5.56x45mm cartridge. The IMP-221 was presciently revolutionary in a variety of ways. The FN P90, HK MP7 and Indian Modern Submachine Carbine all indirectly owe their parentage to the IMP-221.
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While the program itself did not result in a general-issue survival arm, the IMP-221 was the precursor to a broad array of personal defense weapons (PDW) that have subsequently seen wide distribution.
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I would weigh less than 1.5 pounds while retaining an effective range of at least 100 meters. The original specifications demanded a gun less than 13 inches long. 221 Fireball/5.56x36mm wildcat cartridge, this novel bullpup design was intended to equip Air Force bomber crews operating over hostile territory. Cry Havoc GAU-5A: A Hands-On Look at the Air Force’s Backup Weapon Bushmaster Arm PistolĬhambered for the.
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