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)