If purchasing a BCG with a barreled upper, please follow the below general recommendations. Please contact us with any questions before you place your order.
Thank You, MAS Defense.
- M16 Profile BCG for all Pistol / SBR uppers and 16" barrels with a carbine gas system.
- AR15Profile BCG for 16" barrels with a mid-length gas system, 18", 20" and 24" barrels.
Nickel Boron has proven itself to be the most durable finish on the market. It's so good that it's being adopted by the Military and many Government agencies. It will never chip, peal, or flake off. It's much smoother than Hard Chrome, it's easier to clean and you can run it almost lube free for thousands of rounds due to it's self lubricating properties. These BCG's are a huge improvement over a Phosphated BCGs. They are even an improvement over Hard Chrome.
- Nickel Boron Plating is completed by WMD or UCT (who plate for Fail Zero).
- Bolt: MPI Tested and Shot Peened 9310 or C158
- Extractor: Precision Machined Hardened Tool Steel
- Gas Rings: Stainless Steel per Mil-Spec
- Carrier: AR15 Profile Carrier 8620
- Gas Key: 4140 Steel
- Gas Key Screws: Grade 8 Properly Staked
- Cam Pin: Precision Machined
- Retaining Pin: Precision bent and cut to length
- Firing Pin: 416 Stainless Steel
- Assembled ready to drop in your AR15