Fully assembled and ready to drop in. M16 carrier with a Nickel Boron coating. Bolt is made of Carpenter 158 steel. BCG will work with these calibers: 5.56, 223, and 300BLK. Lifetime ToolCraft Warranty! Made in USA.
- Bolt Carriers are made from 8620 Aircraft Quality Steel
- Gas Keys are made from 4130 Steel
- Bolts are made from 9310 Steel
- MPI Tested
- Includes Crane type o-ring
- All Toolcraft products carry a lifetime, no questions asked, warranty.
- 100% Manufactured in the USA
