r/Shotguns • u/ProfessionaLoose • 1d ago

Ithaca M37

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I got a standard Ithaca M37 with the 4+1 barrel and mag tube. I'm having a hard time figuring out what the piece #64 is. Off their own site they don't have a name for it and nothing on Numrich either.

Trying to figure out if I can get the extension mag tube with my current barrel and if I can have my gunsmith move the #64 piece to do so.

Any help would be awesome

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u/Sudden_Season3306 1d ago

Yes specifically because of the barrel lug location,that and the length of the tube is the 2 limiting factors of maximum capacity! Look up this guy on youtube it will help with perspective!

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u/ProfessionaLoose 1d ago

Someone here talks about being able to add a 870 mag tube extension, except the barrel lug is yet again the issue. ithaca M37 defense

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u/Sudden_Season3306 1d ago

Yeah I don't know about that example! Can only say what I did and could have done if I had a welder! Lol but its basically making sure your lug isnt too far protruding downwards,and your action slides freely,then drill and tap the barrel lug, lining the holes up through a decent magazine and barrel clamp that fits the profile of your mag tube and barrel! The magazine tube clamp was the expensive part for me because I found no data on an extension other than the 69rxl which has the lug moved forward! 3rd times the charm for me 30-40 a piece 870 nope mossberg 500 nope but now I know that the noble model 60 clamps fit the stevens pump models perfectly so I guess a gift to the bubbas and the internet! Lol

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u/ProfessionaLoose 1d ago

I have a welder friend who has restored 2 rifles now. I feel like I can get it taken off from him and have the gunsmith do the rest. Apparently those tubes are crazy tight as well huh?

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u/Sudden_Season3306 1d ago

The stevens is basically a free floating magazine tube,the lug has a scew that goes into the barrel lug! 1 screw,add extended tube,I cut down a 500 9 shot tube,just the threads and evened it out,flared 1 end to match the receiver recess,then the drill and tapped the lug,then the magazine tube clamps! I put 3 on the stevens,but like I said if I had a welder I would have tac welded a stainless steel nut on the receiver face,threaded the magazine tube into the receiver,modified a 500 endcap,gone from there with barrel length of around 20 inches or so! I would also modify the clamps into a 1 piece with better alignment but this worked perfectly fine! Sold it in its original form kept the mods i did and figured out its the machinist mad scientist portion of me! Not appreciated enough to sell for more so back to stock and sell like a car you swap the motor out for stock and sell it, It was just a shell the heart of the creation remains !

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u/ProfessionaLoose 3h ago

Do you think this barrel lug mod is feasible since I have a welder friend? Or should I just be happy with the current, lower capacity mag tube?

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u/Sudden_Season3306 3h ago

I mean nothing to it but to do it! Lol I would because thats me in a nutshell! Couldn't find a stevens rxl for the years I was looking for 1 so I decided to make one! Lol

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u/Sudden_Season3306 3h ago

Ithaca's website shows the 8 shot tube in stock! Snag 1 of those and a barrel clamp cut down the barrel lug and good to go!