| 摘要 |
A semi-automatic rifle including a recoiling barrel adapted to carry rearward the elongated bolt carrier containing the bolt for compressing the recoil spring, and a self-unlocking device including a self-unlocking rod longitudinally slidably mounted on the bolt carrier normally engaging the rear face of the barrel in a battery position and a trigger actuating device for thrusting the self-unlocking rod forward during the early stage of recoil for separation of the bolt carrier from the barrel before the barrel reaches the end of its recoil movement.
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