Spare Barrel Nut Wrench for AT3’s Handguards If you lost the barrel nut wrench for your SPEAR M-LOK handguard or your Pro Quad Rail, or just need a spare, we now offer the wrench on its own. The wrench fits standard 1/2 Inch drive torque wrenches and breaker bars. This laser-cut tool provides a precise fit on the wrench flats for the SPEAR and Pro Quad Rail. Any needs you have for installation and maintenance will be made simple. Here’s a quick tip: when you’re installing your barrel nut on an upper receiver, make sure your barrel nut wrench is at a 90 degree angle from your torque wrench. This will provide the most accurate torque for the value you set your wrench to.
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