| 摘要 |
A low impulse firing attachment and companion ammunition for combination gas and recoil operated automatic weapons is comprised of a barrel insert and piston that provide the mechanism for containing the expanding propellant gases produced on firing. Such mechanism provides the required gas pressure at the gas port of the weapon to power the gas system. The barrel insert also allows the use of a sub-caliber piston for the propellant gases to act against. The gas pressure forces the barrel and piston apart, accelerating the recoiling mass rearward to provide recoil operation. The sub-caliber piston allows the use of the relatively high gas port pressure while limiting the peak force transmitted through the adapter. The blank and adapter provide the appropriate gas pressure at the gas port to power the gas system. The adapter also acts as a piston inside the barrel so that the gas pressure forces the barrel rearward, which provides the recoil operation. The adapter is anchored to the receiver, so the loads generated during firing are transmitted through the adapter to the receiver. A barrel insert acts as a sleeve so that the piston can be smaller in diameter than the bore. This allows the use of the same gas pressure required at the gas port for gas system powering to also push against the piston to provide recoil operation while transmitting a manageable peak load through the adapter to the receiver.
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