固定的右侧改成可以左右更换的拉机柄,而枪托也变成ar使用步枪的枪托
缓冲弹簧(buffer spring)6.缓冲器(buffer)5.
下机匣扩展件(lower receiver extension)/缓冲管(buffer tube)4.
预订ar-15: recoil magazine's collection of unique and
br(buffer register) 缓冲寄存器(mbr
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