Used-FAIR COLT Full-Auto M16 Bolt Carrier Group (BCG) Orignal Item Used / FAIR Condition as Shown: Ring around firing pin hole is not as deep as the low grade bolts similar to sample pictured Carrier stamp: "C" Bolt stamp: "MPC" ...
一个是Full Auto Bolt Carrier Group（Full Auto BCG/全自动枪机）上面是纯半自动用的，下面是全自动...
枪机组没改动，仍然使用原来的M4A1枪机组。美国陆军曾在M4 PIP项目中对改进型BCG进行了竞标，但是测试结...
Enhanced BCG Full Auto Style (.308/7.62) Black Nitride Price$351.99 ADD TO CART Quick View Dragon® Dead Air® KEYMO™ Muzzle Brake .223/5.56 Price$142.99 ADD TO CART Quick View NEW ARRIVAL Lantac M-SPEC LPK. AR15 Lower Parts Kit ...
中等长度的导气系统反而比卡宾长度导气系统更加可靠，原因在于其加长的导气管，燃气被引导回BCG的时间...