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). FOR BARRELS NUTS 1.37" OD.
Handguard or parts are NOT INCLUDED. TOOLS CANNOT BE RETURNED.
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7 Reviews Hide Reviews Show Reviews
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Samson/SIG M400 wrench
Let me start by saying that I wasn't super happy that I had to buy another special wrench for barrel nuts BUT I'm glad that I bought this one. I saw some complaints about the SIG/Samson wrench being on the weak side so I took the gamble and got this one instead. Glad I did. It worked awesome, no issues, and couldn't even tell it was used.
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M400 Barrel Wrench
Extremely high quality. Precision cut and very sturdy. A high quality tool that will last a lifetime.
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Money Well Spent!!
Don’t even waste time with Sig’s barrel nut wrench. This one’s actually built to remove a barrel. No twisting bending tweaking, it’s tough and worth every penny!
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M400 Barrel Nut Wrench
Needed it for about 10 seconds, but it works. Much more substantial than the official Sig tool, so great!
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M400 Barrel Wrench
Perfect quality and extremely fast delivery.
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M400 Barrel nut wrench
Solid tool and much better than the factory version in my opinion.
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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.
