Bolt Carrier Group Assy. 5.56 NATO M16 Profile Nitride Bolt & Carrier Retail Packaged - The 223 Bolt and Bolt Carrier group comes complete with Cam Pin Firing Pin and Firing Pin Retainer. - Compatible with 5.56 NATO .223 REM and .300 Blackout - RF-85 Treated: Non-treated - Bolt Carrier Finish: Nitride - Bolt Carrier Material: 8620 Steel - Bolt Finish: Magnesium Phosphate - Bolt Material: 9310 Steel
