Abstract: The present invention is a T-rail that is capable of supporting, in the preferred embodiment, a day and night optical sights, image intensifier and thermal imaging device (scope) and an infrared laser designator. The scope is supported on an upper rail while the designator is supported on an extension that extends perpendicularly away from the upper rail. The T-rail supports these two objects in alignment so that when the T-rail is removed from the weapon and subsequently replaced, the two objects remain in alignment. The T-rail is designed to be mounted to a standard Picatinny rail and comprises a jaw and flange along its bottom to facilitate this mounting. The jaw has a top surface and a bottom surface that matingly engage the top and bottom slope of one side of the Picatinny rail, while the flange has only an upper surface that rests along the top slope of the other side of the rail.

Abstract: A timed round stop for a sprocket fed weapon is disclosed. The round stop pivotable into and out of the ammunition feed path responsive to a control mechanism, for preventing a round being fed to the stripper bolt of the weapon before the stripper bolt is in the correct position to receive it. The control mechanism preferably comprises a ratchet having the same number of teeth as the feed sprocket and mounted for rotation about the same axis and at the same speed as the latter. Rotation of the control ratchet brings each of its teeth sequentially into engagement with a control surface of the round stop. During such engagement, the round stop is held in a position where it blocks the feed path. Further rotation of the ratchet terminates the engagement, and the round stop can then simply be pushed out of the way by the round of ammunition.

Abstract: A feature of this invention is a positively assembled, double acting spring buffer having all spring guides disposed within and extending the full length of the spring assembly.