![]() ![]() For example, aluminum bolt carriers, which have been known to fail and include a “do not use in a duty weapon” warning. This has driven rifle accessory, including Bolt Carrier manufacturers anxious to sell products when the market is down, to swiss cheese the hell out of a perfectly good bolt carrier design because they know the consumer will pay for it, even at the expense of function, reliability, and even safety. Also, some competitors in shooting sports try to gain an advantage with a reduction in weight/mass of BCG called low mass carriers. ![]() The AR-15’s basic design prohibits it from firing out of battery, which would be considered a catastrophic failure. Any reduction in weight of BCG as described may prohibit or lessen the probability of properly chambering a round, and bolt successfully moving into battery. The force required to strip the first round in a 30 round magazine is increased when the weapon is dirty, dry, and fouled. The weapon should still function, though the debate about whether or not it is still as reliable as original full carrier weight does exist. It has become an accepted practice of milling the tail end of a bolt carrier, or lightening the carrier, in the area where the full auto sear is tripped by the carrier during function/cycle of the weapon for proper full-auto function. This modification reduces the mass of the carrier. Engineering and machining modifications have evolved the BCG as the weapon was made available to the civilian commercial market in semi-auto from, per the National Firearms Act. ![]() The weight of a Bolt Carrier Group, or BCG, in an AR15 platform has been modified from the original weight of a full-auto BCG in an attempt to prohibit full-auto conversion of otherwise non-NFA weapons intended for commercial civilian use or sale. The top BCG is a full auto as compared to the “neutered” BCG at the bottom. ![]()
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