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SureFire Optimized Bolt Carrier System SF-OBC-556

SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
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SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System, Black, SF-OBC-556
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SureFire Optimized Bolt Carrier System, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
3 of 7 images
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
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SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
5 of 7 images
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
6 of 7 images
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556
7 of 7 images
SureFire Optimized Bolt Carrier System w/Long-Stroke Buffer and Buffer Spring, Black, SF-OBC-556

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Questions & Answers
Is this compatible with the jp enterprise silent capture buffer?

The problem is the center part has a counter weight so it wouldn't be able to cycle with the JP specific buffer. You can use a normal buffer and spring combo but you wouldn't get the full benefits. The product comes with a buffer + spring though.

by Dan, Verified Owner, March 2, 2022
See 2 More Answers
Can this be used with .300 blackout

It should work with 300 Blk. Maybe a possibility of a issue with some UNsuppressed Sub-Sonic loads... MAYBE. It’s basically a increased mass carrier with a cut back single fastener gas key and shortened buffer to get a longer stroke with the heavier mass essentially getting the gun closer to the “constant recoil” principal.

by Stasia, Verified Owner, June 2, 2021
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Obc for SBR type rifles by Rob, June 2, 2021
Do your home work on what this is and why it exists before you buy! If you’re running this in a mk18 style build and want to run a suppressor in the future do yourself a favor and pick one of these up! Helps do away with bolt jump from over based sho...
Read More...
3/4 found this helpful
Helpful Positive Review
Excellent, but one issue. by SMoLiK, March 17, 2020
This works perfectly in my AR pistol, suppressed and unsuppressed. Makes the firearm extremely reliable. It’s very slippery and easy to clean. The only issue is the back of the gas key strikes the bottom rear of my PRI Gas Buster charging handle. Goi...
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3/3 found this helpful
Read All 2 Reviews

Product Discontinued by Manufacturer

SureFire Optimized Bolt Carrier System has been discontinued by SureFire and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Parts, Bolt Carrier Groups yourself to try and find the perfect replacement for you!

Product Info for SureFire Optimized Bolt Carrier System

Invented by Jim Sullivan, one of the original designers of the M16, 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.image

Features of SureFire Optimized Bolt Carrier System

  • 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

Package Contents:

  • SureFire Optimized Bolt Carrier System

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SureFire Optimized Bolt Carrier System Unavailable & Discontinued Models

List of Unorderable Models

  • SureFire Optimized Bolt Carrier System, Black, SF-OBC-556 , MPN: SF-OBC-556 , UPC: 084871327367 , Code: FS-BCG-SOBC-SF-OBC-556
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