I went back and forth with this for a month. The best solution I found was the NO-M.A.RŪ 308 223 Multical Upper Receiver Vise Block Gunsmith Barrel Nut Tool. $19 on eBay and it works on both the AR10 or AR15. Look into it. I used it on my M&P15 and it worked flawless. I also plan to use it on my M&P10 soon.
I went back and forth with this for a month. The best solution I found was the NO-M.A.RŪ 308 223 Multical Upper Receiver Vise Block Gunsmith Barrel Nut Tool. $19 on eBay and it works on both the AR10 or AR15. Look into it. I used it on my M&P15 and it worked flawless. I also plan to use it on my M&P10 soon.
and on "odd ball" stuff like a lefty upper. Regarding reaction rod -type tools, I'd prefer the Midwest Industries version with the added support. MI-URR<br>MI Upper Receiver Rod