.22 Caliber rimfire adapter system for M16 type rifle

Details .22 Caliber rimfire adapter system for M16 type rifle .22 Caliber rimfire adapter system for M16 type rifle

1977-03-14

1978-01-24

Jordan, Charles T.

Firearms

Breech loading

Magazines

F41C 2500

Patent

active

040696081

ABSTRACT:
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.

REFERENCES:
patent: 834354 (1906-10-01), Ashton
patent: 954799 (1910-04-01), Hammond
patent: 1291689 (1919-01-01), Sheppard
patent: 1396832 (1921-11-01), Graham
patent: 1743472 (1930-01-01), Meyer
patent: 3771415 (1973-11-01), Into et al.
patent: 3776095 (1973-12-01), Atchisson
patent: 4008537 (1977-02-01), Elbe

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