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Bolt Carrier Groups
The AR-15 bolt carrier group (called the "BCG)") is the part of the rifle or pistol that's responsible for performing semiautomatic fire when the trigger is pulled, with a series of steps in this order: Allowing the firing pin to strike the primer on the chambered round. The AR15 BCG contains the gas key, along with the firing pin and extractor. It is central to rifle operation.
How long does an AR-15 bolt last?
The rule of thumb for best performance is to change them out every 5,000 rounds.
What calibers use the same BCG?
They are designed for use in the AR-10 and LR-308 style rifle for calibers in the . 308 family and above. Pistol Caliber / Blowback – A pistol caliber or blowback BCG is one that is built to be used in an AR build chambered for a pistol caliber round such as 9mm or 45 ACP.
Which AR15 BCG coating is best?
Mil-spec AR15 BCGs are phosphate-coated, which is affordable and non-reflective. However, there are many advanced BCG coatings like nickel boron, nitride coatings and DLC which offer superior permanent dry lubricity, which means they require less liquid lubrication. This is beneficial because liquid lubricant traps particulate matter and fouling which can actually accelerate the deterioration of the bolt carrier group.
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