Precision-machined (and upgraded) in the U.S.A.
Our M16-profiled bolt carrier group is manufactured using properly heat-treated 8620 and 9310 tool steel, affording identical performance and reliability to units with C158 bolts at a much lower price. Each bolt and carrier receives quality gas seals on every bolt. Extractors are upgraded to S7 tool steel, affording even greater reliability when cycling than other units.
Each gas carrier key is machined from solid bar stock, then secured with Grade 8 fasteners. All gas carrier keys are expertly torqued and staked. The gas key is treated with an upgraded nitride coating, which provides better wear resistance and naturally higher lubricity compared to old phosphating methods used years before. The entire carrier is also nitrided to provide ample protection from heat with incredibly smooth cycling and easy cleaning, even when heavily fouled.
Finally, each bolt is high-pressure tested (HPT), and MPI (magnetic particle inspected) before shipment, ensuring every unit is free of defects and ready to cycle thousands of rounds. Our meticulous manufacturing, assembly, and quality control processes make our M16-profile BCGs a truly battle-ready component in your next AR rifle or pistol build, at a great price.
Bolt Carrier Group Specifications
- Bolt: Heat-treated 9310 Steel
- Carrier: Mil-spec 8620 Steel
- Profile: M16/Full-Auto
- Coating: Black QPQ Nitride
- Gas Key: Hardened to USGI specifications
- Fasteners: Key torqued staked w/ Grade 8 Fasteners
- Extractor: S7 Tool Steel extractor and extractor spring
- Please Note: Bolt Carrier Group will be packaged dry, lubricate BCG before use.
Additional Information
Is C158 vs 9310 Steel: Is One Superior? (No, Here's Why)
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
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.
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- Caliber:
- 5.56
- Caliber:
- .223 Wylde
- Platform:
- AR15
- Caliber:
- .300 AAC Blackout
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