FA-G31步枪在设计时借鉴了AR10的某些元素,如采用了气吹式导气系统,其上机匣、固定式枪托、圆筒形护手也与AR10的相似。但其机匣上未设辅助推机柄及空仓挂机解脱杆,弹匣座也与AR10的有区别。该枪发射7.62×51mm NATO弹,可以直接使用HK公司G3步枪的弹匣。其浮置式护手采用碳纤维制成,全枪除握把外均喷涂上了4色沙漠迷彩,色彩与美国海军陆战队的作战服装非常接近。 FA-G31 rifle in the design draws on some of the elements of the AR10, such as the use of gas-blown air conduction system, the receiver, fixed rifle, cylindrical armor and AR10 are similar. However, there is no auxiliary auxiliary machine on the handle and hang up the hook release bar, the magazine holder and the AR10 are different. The gun fired 7.62 × 51mm NATO bombs can be used directly HK Corporation G3 rifle magazine. The floating hand guard is made of carbon fiber, except for the grip all the gun are painted on a 4-color desert camouflage, color and the United States Marine Corps combat clothing is very close.