How to Fix a Loose Sig Brace

JerkingTheTrigger has created a step-by-step tutorial for shooters who are looking to move their Sig Sauer arm brace from one pistol receiver extension tube to another tube. The secret? Boil the brace. Tools needed? Minimal:

  • Stretched out SB15 Brace

  • Soup/Stock Pot – Note: This pot needs to be big enough to hold the SB15 and enough water to cover it. Preferably, it should be large enough that it has room to hold all of that and little more so it doesn’t boil over.

  • Water

  • Stove

  • Timer

  • Kitchen tongs



As it turns out, the brace will contract when exposed to high temperatures and will reset itself back to its production diameter. For those looking for detailed directions (or just a good guffaw at their breaking-it-down-barney-style instructions) can hit the link to the original article. 

Nathan S

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

The above post is my opinion and does not reflect the views of any company or organization.


  • waffen ss

    looks more edible than most of the stuff that my wife cooks in her pots 🙁

    • Mystick

      She doesn’t read this blog, does she? 😉

      • BattleshipGrey

        As long as she doesn’t know his screen name he might be okay, well as far as his reputation goes, his stomach is another issue.

  • HonkyTonkHale

    I decided on a route that reduced the likelihood of severe burns. Just apply some golf grip tape on the tube, dab some solvent,on the tape, and slide the brace into position. The Solvent dries in seconds and the stock stays in place.

  • echelon

    Or just buy the same buffer tubes for all your “pistols”. KAK tubes are pretty cheap…

  • tbconrad

    Or for those that don’t cook, a couple wrappings of electrical tape works like a charm 🙂

  • John Daniels

    I used a spiral wrap of friction tape around the tube. That was much simpler than this.

  • Al

    Much easier than that if you have a compressor. Air injected just under the edge with the air nozzle lets you slip it right off. No mess, no wait. Instant.

  • JLR84

    I’ve only ever had my stock on one tube, but I still find it to be too loose. Not so much that it wants to come off, but that it rotates too easily. I’d love a solution for that problem.