I recently did my first build with a Rainer select barrel on a Standard mil-spec receiver with a Aero Precision hand guard. The Aero Precision barrel nut is a royal pain to find the correct wrench for. I returned two before keeping this one. I had to file down two of the pins until they were in the correct location to torque the barrel nut. The pins were in the right place, just a little mis-aligned. The wrench worked just fine after filing. And the Castle nut side also works fine. I haven't put on a muzzle compensator yet, but there are lots of standard wrenches that can do that job so I probably wouldn't use this wrench for that job anyway. It's a good wrench. Not a great wrench, but it was only $25.00.
ohhunt Gunsmith Armorer's All In One Heavy Duty .223 5.56 Stock Combo Wrench Tool for AR15 M4 Rifle Hunting Gun Accessories
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