Junkhunter Posted December 30, 2017 Report Share Posted December 30, 2017 I have my used replacement WW2 German barrel assembly ready to go. How tight to torque the nut down? More then the finger tight my old barrel Was? Any pitfalls to watch out for? Link to comment Share on other sites More sharing options...
Black River Militaria CII Posted December 30, 2017 Report Share Posted December 30, 2017 If you are looking for an actual torque setting there isn’t one since each gun’s parts fit together differently. Tightness should be sufficient to keep it from loosening when shooting. Some MP40s that I’ve had in the shop had the nut tightened enough so that I had to make a couple special tools and special clamp to hold the receiver, use heat and oil to get the nut off. The receivers of these guns can take a lot of torque without twisting and deforming, but most owners anchor the receiver to unscrew the nut by torqueing against the magwell. The magwell is pinned onto the tube with one pin and if used as a counter to unscrewing the nut, the pin holes will enlarge and the magwell become loose. Torquing against the front sling loop can deform the loop.So, if you have a safe way of anchoring the receiver, tighten the nut snuggly and see if it loosens up. If it does, clean the threads of the nut and the receiver and use a drop or two of loctite and snug it up again to where it was before. Hope this helps. Link to comment Share on other sites More sharing options...
Junkhunter Posted December 30, 2017 Author Report Share Posted December 30, 2017 Perfect. Thank You Link to comment Share on other sites More sharing options...
Junkhunter Posted December 31, 2017 Author Report Share Posted December 31, 2017 I put it in my gun cleaning vice locked the rear in locked the front sight block in and torqued it the best I could. If it loosens ill move to the blue loctite if that loosens ill dab the green loctite on. Link to comment Share on other sites More sharing options...
El Duce Posted July 6, 2019 Report Share Posted July 6, 2019 Loosening is a current problem that I have with mine. I may have to use the lock tight on it to keep it on. I thought that I had it pretty tight. But, yesterday while shooting. The nut became finger loose. Any other ideas? Link to comment Share on other sites More sharing options...
El Duce Posted July 8, 2019 Report Share Posted July 8, 2019 Does the lock tight method make it difficult to remove the nut in the future? Link to comment Share on other sites More sharing options...
1gewehr Posted July 9, 2019 Report Share Posted July 9, 2019 A little heat and the LocTite will loosen right up! Link to comment Share on other sites More sharing options...
El Duce Posted July 9, 2019 Report Share Posted July 9, 2019 Does that include heat from firing the gun as well? Just curious about how many rounds it would take to melt the lock tight. Link to comment Share on other sites More sharing options...
TSMGguy Posted July 12, 2019 Report Share Posted July 12, 2019 (edited) Here's a pic of the factory installed staked locking ring on my '41 bnz MP-40. The barrel nut has never been removed. Have no idea what torque value was originally used, but it shows no sign of loosening on its own after 78 years. The sling ring wiggles slightly. Edited July 12, 2019 by TSMGguy Link to comment Share on other sites More sharing options...
El Duce Posted July 14, 2019 Report Share Posted July 14, 2019 Thank you TSMGguy. I have tightened the nut as best as I can, but it likes to get loose. I bought a NOS ring and will try that. Now, I may have to go look, buy my sling ring may be facing the wrong way! If that's the case. It came that way when I bought it 10 years ago!! Link to comment Share on other sites More sharing options...
TSMGguy Posted July 20, 2019 Report Share Posted July 20, 2019 I suspect the stakes in the locking ring prevent self loosening of the nut. Right, the sling loop was factory installed on the right side where the sling doesn't foul the operating handle or get in the way of switching magazines. I'm a leftie, so the sling is always in my face! Link to comment Share on other sites More sharing options...
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