Quarter Circle 10 Weight Adjustable Pistol Caliber Carbine Buffer

Quarter Circle 10 has introduced a new weight adjustable buffer assembly for the AR-pattern blowback operated pistol caliber carbines. The buffer comes with four aluminum, four steel, and four tungsten weights, as well as four rubber spacers. Having that choice of different material weights you can assemble the buffer to weigh from 5 oz (without any weight installed) to 11 oz (with all tungsten weights) and everything in-between. By choosing the proper weight combination you can adjust the overall buffer weight to flawlessly work with the caliber your PCC is chambered in. It will also be handy to adjust the weight for use with a suppressor.

Quarter Circle 10 also provides a chart (see below) which will help to estimate the proper weight for your particular PCC.

In order to make the weight change an easier process, the buffer has the polymer tip/bumper retained by a set screw instead of a roll pin. This feature allows using the provided Allen wrench to remove or install the bumper much easier and faster.

The buffer is made of 8620 steel and has a QPQ nitride finish. It is a drop in part designed to be used in carbine length buffer tubes only. The new buffer is available through Quarter Circle 10’s website at an MSRP of $120.

Hrachya H

Being a lifelong firearms enthusiast, Hrachya always enjoys studying design, technology and history of guns and ammunition. His knowledge of Russian allows him to translate and make Russian/Soviet/Combloc small arms related information available for the English speaking audience.
Should you need to contact him, feel free to shoot him a message at TFBHrachyaH@gmail.com


  • Vhyrus

    They need to make one of these for standard ARs.

    • Michael Boudreaux

      Don’t see any reason you couldn’t use this in a standard ar.

      • Flounder

        It is 5oz with the aluminium weights… So you could… But it is way heavier than standard. I also see no benefit to this. You can already buy individual weights and replace them…

      • BillC

        Still wouldn’t be a good idea since the heaviest of carbine buffers, the H3 is about 5.6oz.

      • BillC

        Also cost. The H3 buffer is around $40, this buffer is $120, and that extra weight for a buffer isn’t needed on an AR15.

      • SGT Fish

        if you know anything about 9mm ARs, the buffer either A. needs to be longer, or B. needs a spacer. So it looks like this buffer is longer than a standard carbine buffer.

  • mrsatyre

    “weight adjustable buffer assembly for the AR-pattern blowback operated pistol caliber carbines”

    Say that ten times fast.

    • Rick O’Shay

      For some reason that whole thing reads like Ralphie in Christmas Story telling Santa what he wants.

  • Capincurt

    Just like the kak industries one neat