Benellisam Posted September 26, 2021 Share Posted September 26, 2021 Hi all, new here, thank you in advance for help! My question is regarding my new to me M3 which I'm in the midst of modding. I've scoured these forums and numerous other places but just can't seem to get a straight answer.. I just bought a Benelli 61171 Supernova Collapsible Stock / MR1 from Benelliparts.net. Now I need the adjustable stock tube and this is my problem/question. My M3 is from 2002 (code BN) and it appears that the tapped hole in the receiver is the smaller vs. the newer variants of M3 (I read somewhere 19 x 1 mm vs, 21 x 1 mm). I learned this because the stock tube I bought from (Midwest : 61364 Benelli SuperNova Multi Position Stock Tube for Collapsible Stock, For Serial #'s Before Z543224) was too big. So I just bought the other from them (Benelli M3/M4/Supernova Tactical Stock Tube, For Serial #'s Above Z543224 61026). However, I just read somewhere else, same thing happened to someone else and that didn't fit either. So do I need to find this one in stock somewhere (Benelli Supernova or MR1 5 Position Recoil Tube SKU: 70071)? Or am I going to have to use what I got and re tap or re thread the current part? Thank you so so much in advance for any insights!!!! Quote Link to comment Share on other sites More sharing options...
Doge Posted September 26, 2021 Share Posted September 26, 2021 You need to thread your receiver to M21 x 1. If you try to thread the tube it will be too weak also you will need it both M21 and M19. Quote Link to comment Share on other sites More sharing options...
Benellisam Posted September 26, 2021 Author Share Posted September 26, 2021 14 hours ago, Doge said: You need to thread your receiver to M21 x 1. If you try to thread the tube it will be too weak also you will need it both M21 and M19. Got it, can you elaborate more regarding "you will need it both M21 & M19" Thank you so much for confirming this! Quote Link to comment Share on other sites More sharing options...
Doge Posted September 26, 2021 Share Posted September 26, 2021 There's no easy way to do this. Just forget it. It's gonna be too expensive to make happen and you will get bad results. You need the M19 threads to be about 7-8mm in length, then a relief groove so it can transition to M21. Even if rethread it successfully it will still be too weak because the inside groove. The older M19 aluminum and steel tubes can get away with this because the regular pistol grip stock and field stock supports the receiver and they don't have an inside groove or steel ring. Quote Link to comment Share on other sites More sharing options...
AIRB0RNE6176 Posted November 18, 2021 Share Posted November 18, 2021 Hey Doge, sorry to resurrect this older post, but is there any way you could re-upload the two (2) pics you had. Not sure if their "lease" has expired. THX Quote Link to comment Share on other sites More sharing options...
Doge Posted November 19, 2021 Share Posted November 19, 2021 Here's the representation if you had a M19 & M21 threads together. 1 1 Quote Link to comment Share on other sites More sharing options...
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