Barrel Nut Wrench for SIG M400 Tread Handguard
This the AB Prototype, LLC. custom laser-cut wrench for the SIG Sauer M400 Tread Barrel Nut. It will work for removing and installing the barrel nut of the SIG M400 Tread free-float handguard. Laser-cut 3/16" steel and nitride coated for durability. Tougher than the thin factory wrenches. Fits snug to barrel nut, laser engraved with the AB Prototype logo.
Includes: 1 AB Prototype, LLC. SIG M400 barrel nut wrench. Requires 1/2" torque wrench (not included).
Handguard or parts are NOT INCLUDED. TOOLS CANNOT BE RETURNED.
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M400 Tread Barrel Nut Wrench
Was helping a friend who got a live round jammed in the chamber of his Sig Sauer Tread AR-15. Couldn’t get the round out, so he decided to just put on a new barrel. Unbeknownst to us, Sig uses a proprietary barrel nut; of which none of my barrel nut wrenches fit. So, I ordered the AB Prototype barrel nut wrench for the M400. It only took a few days to arrive, and it fit and worked like a dream. The old barrel was off, and the new one on, in just a few minutes. You can’t ask for a better wrench than the one from AB Prototype.
