초록 ▼

A unitary bolt and chamber adapter for field replacement, without tools, of the conventional bolt assembly of rifles of the type M16 and AR-15 provides for the use of conventional .22 caliber long rifle rimfire ammunition in the rifle instead of the larger conventional centerfire ammunition. The bol

A unitary bolt and chamber adapter for field replacement, without tools, of the conventional bolt assembly of rifles of the type M16 and AR-15 provides for the use of conventional .22 caliber long rifle rimfire ammunition in the rifle instead of the larger conventional centerfire ammunition. The bolt functions in semiautomatic fire by conventional blowback action. Through cooperation with an improved .22 caliber rimfire magazine adapter, the breech automatically remains open after firing the last round from the magazine. The bolt guide rails are flexibly attached to the chamber providing for reliable operation in a larger number of rifles. A spring actuated forward locator on the bolt assembly keeps the adapter seated in the rifle chamber, compensating for differences in gun receiver lengths. An undercut bolt face provides the positive extraction of a double extractor system with a single extractor, and a groove-and-land chamber adapter provides reliable operation with good and poor quality ammunition. A gas diverter protects the rifleman\s eyes and provides a clean receiver without modifying the original gun.

대표청구항 ▼

An adapter system for converting a rifle normally utilizing high power rifle cartridges of a given projectile caliber to a rifle utilizing low power cartridges of the same projectile caliber, the said rifle having a high power cartridge chamber; a gas tube; a receiver having a lower receiver extensi

An adapter system for converting a rifle normally utilizing high power rifle cartridges of a given projectile caliber to a rifle utilizing low power cartridges of the same projectile caliber, the said rifle having a high power cartridge chamber; a gas tube; a receiver having a lower receiver extension socket, a magazine latch, and a bolt catch; the said adapter system comprising: a. A low power cartridge bolt and chamber adapter assembly insertable in the said rifle receiver and high power cartridge chamber, the said bolt and chamber adapter assembly having a rear retainer, guide rails with the said bolt slidably positioned thereon, a cartridge rim receiving face on the said bolt, and the said chamber attached in flexible relationship to the said guide rails; b. a forward locator pivotably attached in spring loaded relationship to the said rear retainer of the said adapter assembly cooperating with the said rifle lower extension socket to maintain the said chamber adapter seated in the said rifle high power cartridge chamber; c. a gas diverter attached to the said adapter bolt cooperating with the said rifle gas tube for diverting powder gases and residue outside the said receiver; d. means for providing a sealing relationship between the said projectile of the said low power cartridge and the said adapter chamber; e. a cartridge case rim retainer having an undercut recess positioned on the said adapter bolt face; f. an adapter magazine for feeding the said low power cartridges into the receiver, removably attachable to the said rifle receiver by the said magazine latch, the said magazine adapter having a follower spring and a lifter spring; and g. means for coupling the said follower spring to the said lifter spring only when the said adapter magazine is empty of cartridges, the said means cooperating with the said rifle bolt catch to hold the said adapter bolt in the open position after firing the last cartridge from the said adapter magazine.