Surefire Optimized Bolt Carrier Group with Long-Stroke Buffer and Improved Buffer Spring

Optimized Bolt Carrier Group Features The SureFire Optimized Bolt Carrier (OBC) doubles the reliability of any M4/M16/AR variant weapon system during suppressed and suppressed firing. Its patented design allows more time for reliable feeding of ammunition from the magazine and nearly eliminating bolt-over-base malfunctions. The OBC also delays unlocking of the bolt during the firing sequence which allows expanding gases more time to exit the bore in turn reducing back-pressure gases exiting the upper receiver group. Additionally the neutrally balanced counterweight improves carrier and barrel extension lock-up nearly eliminating bolt bounce. The OBC reduces felt recoil for better target tracking and greater weapon control when firing. Coated with an advanced anti-friction coating the OBC resists friction during use and makes cleaning easy. Optimized Bolt Carrier Group Specifications Manufacturer: Surefire Manufacturer Part #: Sf-obc-556 Model: OBC Type: Bolt Carrier Group Color: Black Caliber: 5.56mm Construction: Steel Alloy Coating: DLC And S-line Anti-friction Coatings Weight: 13.6 Oz (385 G)