Knoob07

Thanks again all. The tap did go in quite easily once I got over the initial resistance - there were a couple of tighter spots but it was all easily done by hand. I expect anytime it was a little tighter it was cleaning the existing threads up. It definitely cleaned out well and completely aligned to the original threads. I was also able to run the receiver tube thru a matched thread cleanup which i think was also important to ensure i didn’t repeat my mistakes. Thanks for the recommendation on alumablack - i didn’t even know that was a thing and I’ve got a bottle on the way.

All, i wanted to just follow up on my results here for posterity on the off chance that google brings some other lost soul to this thread in the future. I was able to buy an M21x1 tap and with it I was able to “restore” sufficient thread for a good solid fit. I did slather it up with loctite and i let it cure for 24 hours. I ran a few shots thru it (in a vice at an outdoor range pulling the trigger with string for safety) and can say with reasonable confidence that it’s pretty solid. I will be using the gun very carefully for the next few weeks putting a lot of rounds thru it and checking / re-confirming a very tight and strong fit of the tube in the body of the gun. Thank you all again for the wisdom - I will continue to proceed with caution, but I’m thrilled to have my M4 back together as our Italian overlords intended.

I was replacing an OEM 1-position with an OEM 3-position. The M4 came with the “1 position” (not sure what it’s actually called) and i replaced it with a 3-position from beneliiparts.

All, thank you for the thoughtful responses. Yes this was the result of over-torquing during an install that went wrong. I’m not certain but i suspect my tube wasn’t aligned right and i know I mis-interpreted resistance as “wow I’m really feeling that loctite even when it’s wet!”. Don’t try this at home is good advice for a hack like me, i just don’t always listen to it. Doing some research online most suggest the thread pitch is 21 x 1 or 18 x 1. I’ll double check at a hardware store with the tube thread. Thanks again - I’ll report back.

First - i need to go on record as an idiot - I grievously mis-installed an OEM 3-position recoil tube and ended up pretty badly mangling the threads on the body of the fun (horror show photos attached)…. Any suggestions? Otherwise I’m going to go down on bended knee and ask Benelli if they can repair… PS i have already beaten myself up pretty hard over this stupidity - but feel free to unload some more on me as appropriate.