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SureFire Optimized Bolt Carrier Group


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SureFire Optimized Bolt Carrier Group

The SureFire Optimized Bolt Carrier Group was invented by Jim Sullivan, and it is designed to improve the functionality of an M4,M16, and 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 boltover 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.

SureFire SF-OBC-556 Optimized Bolt Carrier Group Features

Neutrally balanced counterweight automatically reduces cyclic rate, negating the need for switch or setting adjustments.

Improved cam path delays unlocking, allowing the chamber pressure to drop another 15% which permits more gasses to exit the bore

Nearly eliminates bolt bounce

Long stroke design improves reliability, allowing ammunition more time to feed properly

Utilizes Mil-Spec bolt and components

Anti-friction coating resists corrosion and makes cleaning easy

SF-OBC-556 comes standard with Optimized Bolt Carrier, Long-Stroke Buffer, and Improved Buffer Spring

Product Manual


Caliber 5.56mm
Construction Steel Alloy
Coating DLC and S-Line Anti Friction Coatings
Weight 13.6oz (385g)


ITAR Notice

Export of the commodities described herein is strictly prohibited without a valid export license issued by the U.S. Department of State, Office of Defense Trade Controls, prescribed in the International Traffic in Arms Regulation (ITAR), Title 22, Code of Federal Regulations, Parts 120-130.


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