Monday, November 23, 2015

Suomi M31 receiver thread repair sections





I made a handful of these a while back and after I stopped selling parts to others, I put the remaining ones in storage. I found them the other day and put them up for sale on a gun forum, not thinking there was any real demand for them. I sold out in about five minutes.
I guess since they turned out to be popular, I will make another run of them. They are original ID and OD, and have a shoulder for welding to the receiver so you're not welding on the threads themselves. They're about an inch long overall.













Here's what they look like.





Here's one with the cap screwed on. Cap NOT included.

13 comments:

  1. HI, IF YOU HAVE A FEW OF THOSE IN STOCK, I'LL TAKE 2 , Chris, i'm at Cbbiz1@yahoo.com

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  2. James,

    Can you share the info where you got the 37/31mm tube for the rings and the 80% tubes? This tube size is unobtainium in the US.


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  3. Can I get one, mglsite@charter.net

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  4. Any chance of another run? I need "a few" :-)

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  5. brilliant idea and beautiful work. You are definitely inspiring. I appreciate all of your posts, as well as the time and effort you expend into this blog.

    I really like how you describe all the mods that you make to the various parts kits in order to keep everything legal. I feel as though many posters/vids gloss over many the modifications required by the ATF (ie open to closed bolt, fixed pin to moving firing pin, etc).

    Another thing, I'm unsure if there is an extant product or not, but if there is nothing currently available, I have an idea for a product that I'm certain you could produce and profit from. My idea is for a basic thread adapter for the stupid 1-3/16"x 12 (?) AR buffer tube threads. The adapter would screw over (female, lol) teh male buffer tube threads, then neck down to a reasonable size, something like 1"-8 or 3/4"-16, a size that a mere mortal might already have or at least be able to easily procure. With this adapter, people who otherwise couldn't machine a 0% AR lower due to the oddball threading are now back in the game. Just a thought. Maybe there's a reason for those gigantor, unheard-of 1-3/16" threads. Heck even harbor freight sells a tap n die kit with some pretty goodly sized NPT jawns...

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    Replies
    1. I've bought the tap as cheap as $10 on eBay.
      The Problem with your idea is that the AR carrier is 1" diameter, so large threads are necessary.

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  6. Also, what size are those Suomi cap threads? And what size/kind of pipe/tube do you buy for your Suomi receivers? I'm looking to source something that's sized close dimensional-ly already. Harder not smarter and all, or was it smarter not harder....?

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    Replies
    1. I sell 2/3 length and full length tubes that already have threads cut.

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  7. Does this match the size and threading to receive a AR-15 free float handguard? I ask because I am interested in a part like this that would also have set screws in it. I would like to be able the mount this on a paintball barrel to then enable a AR-15 free float handguard to be used.

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    Replies
    1. Not quite.
      You're looking for a 1-1/4"x16 (if I recall correctly) thread. These are 1.23x20

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    2. Thank you for confirming. My search will continue. :-)

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