robtmc Posted September 26 Report Share Posted September 26 Wanted to replace my old Midwest handguard that had to be loctite bonded to stop slippping. Mid-70's DPMS LR308 receiver. Got an Aero S-ONE FF handguard with barrel nut claimed to be "ar308" compatible. DPMS is mentioned. No way, started a thread or so then needed a wrench to got any further. NOT cross threaded. The Midwest nut goes on by hand. Aero claimed lack of commonality with the 308 and claimed nothing they could do. I have trouble believing the upper receiver threads are that mismatched. I know Armalite is different but should not have even started if that was the case? Aero's description for just the barrel nut does state only for their threaded upper receivers. Quote Link to comment Share on other sites More sharing options...
sketch Posted September 27 Report Share Posted September 27 Pic's would help. I can't say a mid 70s dpms is compatible with newer areo parts? Is there a chance that the barrel nut was cross threaded before? *Just for shits make sure you use factory torqued specks. * Quote Link to comment Share on other sites More sharing options...
robtmc Posted September 27 Author Report Share Posted September 27 Bought the upper in 2007, not 70's. Not cross threaded, can get it on with some effort, not cross threaded, the Midwest nut goes on by hand still. Quote Link to comment Share on other sites More sharing options...
robtmc Posted September 28 Author Report Share Posted September 28 I did find an old post from a guy had the same oversized thread problem. Tolerance stacking. Funny because the Midwest barrel nut fits fine with just a touch of drag in a few spots. Tried a JP HG years ago with the tight thread problem and sent it back. Had forgotten that. Quote Link to comment Share on other sites More sharing options...
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