Made in the USA. Our bolt carrier group is manufactured using properly heat-treated 8620 and 9310 tool steel, which provide even better wear and shatter resistance than the original (mil-spec) Carpenter No. 158 steel used in older bolts. Each bolt and carrier is high-pressure tested (HPT), and MPI (magnetic particle inspected) before shipment. The gas key is treated with an upgraded nitride coating, which provides better wear resistance and natural lubrication compared to the old chrome-line and phosphating methods used years before.
Each gas key is machined from solid bar stock and then secured with Grade-8 fasteners. Bolts are properly staked to prevent them from ever loosening in the field. The entire bolt carrier is also nitrided to provide ample protection against heat and carbon fouling, making this M16-profile BCG a truly battle-ready component in your next AR rifle or pistol build.
- Bolt: Heat-treated 9310 Steel
- Carrier: Mil-spec 8620 Steel
- Profile: M16/Full-Auto
- Coating: Black Nitride
- Gas Key: Hardened to USGI specifications
- Fasteners: Key staked w/ G8 Fasteners
- Extractor: S7 Tool Steel extractor and extractor spring
- Please Note: Bolt Carrier Group will be packaged dry, lubricate BCG before use.
Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or “assault weapons” (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily
80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.