Self Contained Bolt Carrier Group, One of the more interesting upgrades you can make is swapping the bolt carrier group. Shop with us and get free shipping on all orders over $139! LMT bolt and bolt carrier groups are machined with an emphasis on tolerance and fitment to ensure maximum weapon reliability. It takes the brunt of the recoil produced by the gas system . The bolt carrier group (BCG) is one of the most important moving parts in the AR-15. Assembled and ready to go Phosphated 8620 Steel Carrier Carpenter 158 Bolt (Extractor and Bolt Gas Rings Included) M-16 bolt Carrier Assembly. The Stealth Recoil Spring ™ is The bolt carrier is CNC-machined from AISI 8620 steel, selected for its core hardness, tensile strength, and fatigue resistance. If the gas port is the lungs, then the bolt carrier group is the heart. From materials and finishes to testing and quality standards, every Grab a quality AR-15 bolt carrier group. 158® steel, shot peened for increased strength, includes tool steel machined extractor and Ahh, the bolt carrier group—one the surest ways to start an online argument about the AR 15 is to ask which is the best one. There are different types of nitride coatings that go by many The AR-15 bolt carrier group is the heart of your rifle — get it wrong and nothing else matters.
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