为了迎合美国用户射击习惯,该枪采用AR15系步枪标准下机匣,而上机匣的设计独具特色。如导气系统非同一般步枪设在枪管上方或下方,而是设在枪管左侧,机匣上方设有桥式皮卡汀尼导轨,且桥架采用多孔式设计,导轨较高。为与机匣导轨高度保持一致,上护手亦较高并设有导轨,同样采用多孔式设计。导轨高度的增加,使瞄准时的姿势更加舒适,同时又不增加全枪质量。机匣与护手之间设有 In order to meet the shooting habits of US users, the gun uses AR15 rifle standard under the receiver, and the design of the receiver unique. Such as the gas guiding system non-ordinary rifles located above or below the barrel, but located in the left barrel, the casing above the bridge with Picatinny rail, and the bridge with porous design, high rails. In order to maintain the same height with the guide rail of the receiver, the upper hand guard is also provided with a guide rail. The same porous design is also adopted. Increased rail height, so that aiming at the more comfortable posture, without increasing the quality of the whole gun. Between the receiver and the hand guard