FN Herstal

The SureFire Optimized Bolt Carrier

Fountain Valley, CA—SureFire, LLC, manufacturer of the world’s finest—and most innovative—illumination tools and tactical products, has launched an informational video on its revolutionary Optimized Bolt Carrier (OBC).

The SureFire OBC is designed to greatly increase the reliability of an M4/M16/AR variant during both unsuppressed and suppressed firing. The OBC comes as a package with the OBC bolt carrer group as well as buffer and buffer spring. This patented design makes numerous improvements to the standard Mil-Spec full-auto bolt carrier group starting with delayed unlocking of the bolt during the firing sequence. This delayed unlocking is a result of a lengthened cam pin slot and our neutrally balanced counterweight. This delay allows expanding gases more time to exit the bore, lowering chamber pressure by 15%, which not only reduces wear and tear on parts, but also reduces back-pressure gases exiting the ejection port.

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Next the shortened gas carrier key in conjunction with shorter buffer allow a 60% increase in stroke. This increase in stroke gives the magazine more time to feed, which can be essential as gas ports erode and magazines become dirty from austere environments. This additional stroke also provides smoother and more reliable feeding due to increased inertia when the OBC picks up a round from the magazine.

The previously mentioned neutrally balanced counterweight works three times in the cycle of operation. First the counterweight delays unlocking, as mentioned before. Secondly, the counterweight keeps the carrier group to the rear for additional time, allowing more time for reliable feeding of ammunition from the magazine and nearly eliminating bolt-over-base malfunctions. Lastly, this 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.

www.surefire.com

15 Responses to “The SureFire Optimized Bolt Carrier”

  1. greg stone says:

    make a piston version!

  2. Chad says:

    as much as i hate non standard ar parts, i may get one of these to swap between my ar’s.

  3. Paul T McCain says:

    LMT Optimized BCG is a much better choice.

  4. Adam says:

    Any better than a nickel boron bcg or the LMT?

  5. mark says:

    Wasn’t reducing the full auto rate of fire for increased controllability one of the main design goals with the OBC? Surprised not to see that mentioned.

  6. Phil Myers says:

    What’s the cost?

  7. Garin says:

    Yes Mark you are correct. The OBC does significantly reduce the RPM for FA platforms by the delay of unlocking and dwell time of the bolt movement. That allows more control of weapon in FA.

    • mark says:

      It would be cool to see a comparative test of the OBC vs standard carrier in terms of controllability.

      Ie 6 round group dispersion at 15, 25, 50, 100yd standing; 100,200yd from the prone with bipod.

      • Rob says:

        Recoil web did a comparison video with a mk18 and a normal carrier and a OBC. It was dramatic and the target had a much tighter group.

        • Aaron Orr says:

          Sounds like a great solution for those that can go cyclic with their firearms. For those of us without D.I.A.S. or pre-86 transferable lowers it is more of a limited return on investment component.

    • Esteban says:

      Sounds like it would also help with port pop on suppressed rifles.

  8. Leon says:

    Why not SBN treatment?

  9. PBro says:

    I wish they would quit teasing the XVL2. Keep the weapon lights coming.

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