| 摘要 |
A safety cam pin assembly for replacing the standard cam pin of automatic rifles of the M-16 type, the safety cam pin assembly consisting of a modified cam pin and an obstruction safety bushing. The modified cam pin is the same as a standard cam pin with the exception that the lower portion of the cam pin shank is of reduced diameter by an amount equal to twice the wall thickness of the safety obstruction bushing, and a keyway is provided on the cam pin. The safety obstruction bushing is a sleeve which slips upward over the reduced lower portion of the modified cam pin and is provided with key elements to interfit with the keyway of the cam pin so that when the key and keyway are interfitted the bushing is rotatable with the cam pin. The sidewalls of the obstruction bushing are diametrically apertured with two sets of orthogonally disposed apertures, one set of such apertures being alignable with the firing pin aperture through the cam pin and of sufficient diameter to permit passage of the firing pin therethrough. The second set of apertures are of reduced cross section and do not permit passage of the firing pin entirely therethrough and thereby prevent the firing pin from reaching a round of ammunition when the cam pin has been omitted from the bolt assembly. Detent means are provided to retain the safety obstruction bushing in its firing pin obstructing position until such time as the cam pin is properly reinstalled into the bolt assembly.
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