![]() ![]() You’ll find that there are a variety of quality M16 full auto bolt carrier groups on the market. The cam pin keeps the bolt inside the bolt carrier and keeps it in line, it keeps the firing pin in line, it “cams” the bolt into the locked position as the BCG finishes its forward movement into battery, and it provides many more functions that are crucial to the operation of the firearm. A firing pin is a component that strikes the primer of a cartridge, causing the gun to detonate. Proper staking keeps screws from backing out. It should be tight and staked to create a seal. Also called the “bolt carrier key”, this essential part funnels gas from the gas tube into the bolt carrier. This is typically going to be made of 9310 or Carpenter 158 steel. The bolt helps guide the round into the chamber, extracts the spent case, then ejects the spent cartridge once you’ve fired the gun. It’s important to clean and check it regularly to ensure that the screws attaching it to the gas key do not come loose. This is the external housing for the bolt and is attached to the gas key. ![]() First off, here’s a breakdown on the major components that make up a bolt carrier group:
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