Surefire Optimized Bolt Carrier Group

Item Code: SF-OBC-556
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  • Weight: 13.6 oz.
  • Steel Alloy Construction
  • 5.56 mm Caliber
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    Surefire Optimized Bolt Carrier Group  is designed to improve the functionality of an M4/M16/AR variant weapon system during both unsuppressed and suppressed firing. This patented design makes numerous improvements to the standard Mil-Spec full-auto bolt carrier group which allows more time for reliable feeding of ammunition from the magazine, 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 also reduces felt recoil, allowing for better tracking of sights and more control of the weapon when firing. Coated with an advanced anti-friction coating, the OBC resists friction during use and makes cleaning easy. For the ultimate in reliability, choose the SureFire OBC.


        • Caliber: 5.56mm
        • Construction: Steel Alloy
        • Coating: DLC and S-Line Anti-Friction Coatings
        • Weight: 13.6 oz.


        • Designed by firearms industry legend and M16 designer Jim Sullivan
        • Long-stroke design delivers 60% more travel beyond the magazine, increasing magazine feed time and reducing the chance of bolt-over-base malfunctions
        • Dual-spring dwell weight significantly delays bolt carrier direction-change for increased reliability
        • Improved cam path delays bolt unlocking for a 15% decrease in chamber pressure before unlocking
        • Self-lubricating, Diamond-Like Carbon (DLC) and S-Line coatings reduce friction for consistent, dependable operation in the most adverse conditions
        • Mil-Spec bolt proof-tested and magnetic particle-inspected to meet the highest standards


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    WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to

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