Lfryklu Posted January 27, 2022 Report Share Posted January 27, 2022 Hi Guys, With help from a number of you last year, I'm wrapping up, or at least I think I'm wrapping up my .308 build, but still the handguard I want is BO by Aero Precision & has been for about a year now. Lots of 15" HG's are available from AP, but I want a 12" (12.7") by their measure anyway an M-Loc version, to put on my 18" Criterion barrel. So, in meantime while waiting thought I'd move forward and mount the barrel to the AP Upper Receiver w/Aero Barrel Nut, then mount a HG later. But, I'm reading though different web articles that while torqueing the nut, its possible to twist the Upper Receiver out of shape. On an AR-15 .300 BO build that I did last year, I just put the upper & lower into a vise block set, inserted the barrel into the upper put my Armorer wrench tool on the nut, connected my torque wrench and then hit the spec. Then I adjusted the gas block, put the handguard on & it was done. This build though is LR-308 so its similar, but is still a little different. Being physically a larger upper & lower, don't think will fit my AR block set, which right now I cant find anyway, but now I'm thinking I may need different approach. I contacted Brownell's Tech Support and they recommended a 'Barrel Extension' wrench - 080-001-040WB 308AR Barrel Extension Torque Tool Mfr Part: 100571 Is this what I need to keep from accidentally twisting the upper when torqueing the barrel nut down to spec? Supposedly to more evenly distribute the torque to avoid twisting the upper. I chatted with Aero Precision & told me they use something similar - https://www.midwestindustriesinc.com/MI-Upper-Receiver-Rod-308-p/mi-308urr.htm Is there a simpler way to get this done, with just my Armorer's wrench, and torque wrench? Possibly just a larger vise block set to accommodate the larger .308 upper & lower ? Let me know. Thanks & best regards, Lfryklu Quote Link to comment Share on other sites More sharing options...
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