TNW M31 Suomi SBR

[Dave Markowitz]

BATF approved the Form 1 on 7/19 that I filed in April and I found out earlier this week. (ATF didn't email me the approved F1 with stamp, like they are supposed to. I found it sitting in my account when I logged into atfonline.gov.)

Tonight I engraved the receiver and chopped the barrel to 12.4". I cut it a little long with a hacksaw, then faced and crowned the barrel in my lathe. The barrel is ~19.5mm in diameter, so it just fit through the 20mm spindle bore. The barrel steel cut easily with a carbide indexable insert while turning at ~450 RPM.



Aside from looking right, it handles a lot better. It's still heavy but the balance is much better without the extra 4.5" of barrel sticking out on the end. I'm looking forward to shooting it soon.

 

[horsemen61]

Awesome thanks for sharing

 

[USAF_Vet]

Semi auto, I assume?

Very nice.

 

[bikerdoc]

I like the look. You did a good job.

please give as range report.

 

[Dave Markowitz]

Semi auto, I assume?

Unfortunately, yes. Although I doubt I'd be able to afford all the 9mm I'd shoot up if it had a happy switch.

I have shot it quite a bit with the original 16.5" barrel, including in a practical carbine match. It handles so much better now, though.

 

[Ryanxia]

Nice Dave! I like projects like these, the older stuff that was designed with shorter barrels is much cooler to SBR than every day AR's/AK's (although I admit my first form 1's were an AR and an AK).

I have a PPS-43C in 9mm that I plan on SBRing at some point. I really hope 41P holds off a long time or goes away because I can't see sending fingerprints and photographs to the ATF.

And thanks for the tip on not getting the email, I have a friend who should be getting approved any day now and I mentioned it to him because he never logs in just checks his email.