In this section you will find accessories sold for the AR-15 that come in Colt factory packaging and Colt AR-15 parts. There will also be information and images of Colt factory individual lower receivers as sold by Brownells and Arms Unlimited.
- C on bolt carrier: ?
- C MP on barrel: Colt Magnetic Proofed
- O on barrel (outside of chamber area): Chrome Lined
- MPC on bolt: Magnetic Proofed Colt
- R on barrel (outside of chamber area): Rosco/ESS
- S on selector lever: Schmidt
- W on barrel (outside of chamber area): Manufactured by Wilson
- .4 on barrel extension: Colt
- .. on barrel extension: Microbest