美军在伊拉克及阿富汗战场上缴获了大量的7.62×39mm弹药,为了能直接使用这些弹药,美国特种作战司令部曾临时招标研制一款发射该弹的武器。奈特军械公司(KAC)设计的SR47在竞标中胜出。该枪采用M4卡宾枪的枪机设计,可直接使用AK47的弹匣。由于在伊拉克及阿富汗战场上的7.62×39mm弹药很多已是锈迹斑驳,且不同地方生产的AK47弹匣公差太大,因而SR47在使用中常出现供弹故障问题。故此SR47项目最终被取消了。 The U.S. military seized a large number of 7.62 × 39mm ammunition on the Iraqi and Afghan battlefields. In order to be able to use the ammunition directly, the U.S. Special Operations Command has temporarily tendered a weapon to launch the missile. SR47 designed by Knight Arms Company (KAC) won the bid. The gun with M4 carbine bolt design, can be used directly AK47 magazine. Since many of the 7.62 x 39mm ammunition in the battlefields in Iraq and Afghanistan are already rusty and the AK47 magazines produced in different locations are too tight, the SR47 is often bombed in service. So the SR47 project was eventually canceled.