The Bolt Carrier houses the bolt and is attached to the gas key and is in direct contact with the spring and the buffer.The BCG consists of the carrier, bolt, gas key, firing pin, and cam pin. Some ARs like the AK-47 use a gas-piston system that pushes pistons to function, and these are generally regarded as slightly more reliable. It’s gas-operated and redirects the gas directly into the chamber which ejects the cartridges and cycles new rounds. Simply put, the BCG’s duty is gas-operated and performs firing functions like striking the firing pin, using gas via fired rounds to push the recoil spring back, ejecting the fired rounds, chambering a new round from the mag, and re-cocking the hammer in one cycle. It’s basically the heart and soul of a semi-automatic rifle, and before we start to blatantly humanize weapons, let’s just go over the details. In this BGC buyer’s guide, we’ll talk about the essential features, finishes and coatings, materials, full-auto or lightweight types, and other important factors to consider when choosing the best bolt carrier group.Ī bolt carrier group isn’t the most important part of an AR, but it might as well be. All of them really just get the job done.īut, the price range, characteristics, qualities, and those tiny details can really make a difference, along with this guide, will help you really narrow down the vast options that are available today. Regardless of whether you want to build a new AR-15 from scratch, or just want a simple upgrade, the bolt carrier group definitely needs a little bit of digging and researching relevant info.Ī lot of the ones you see on the internet could seem like the right choice for your semi-automatic rifle, and to be honest, you won’t be wrong if you go for an Aero Precision, Toolcraft, Bravo Company, Spike’s Tactical, or the WDM Guns models. Choosing the right bolt carrier group for your AR-15 or your M16 semi-automatic rifles can be frustrating, seeing all the really cool options.

So you decided to build a semi-automatic rifle with the proper upper receiver. Toolcraft Logo’d Left Handed 5.56 Nitride MPI Full Auto Bolt Carrier GroupĪero Precision 5.56 Complete Phosphate BCG

WMD Guns M16 5.56 NATO Nickel Boron 9310 Steel BCGīravo Company Manufacturing BCM M16/AR-15/M4 BCG

Semi vs full auto bcg