AR-15 Style 9mm Heavy Barrel 16.1 Inches 1/2x28 Threaded Muzzle - $99.00 : Buy
cheap enough with extention already on it
anybody use the k31 9mm barrel to do a 9mm ar-15 upper?
looking at the photos from copes it looks doable-
i am thinking maybe a gas operated 9mm just to play with--maybe a 357sig gas pistol build--LOL
yeah you could do it..... but id buy the other barrel that rus listed first. lol
say what you mean & mean what you say
YES, i work for TEC Tactical.. 07/02 SOT
For the gas operated upper you'll need to thread the chamber end to 13/16"-16 which is .812.5" diameter. The back end of the suomi 31 barrel is around .78" ish IIRC so it is too small to thread for the barrel extension without a sleeve. At that point you might as well just get a green mountain blank. If you're going with a gas operated the barrel RR linked to has a blowback "barrel extension" on it which won't work for gas operated. You'd have to remove the blowback barrel extension (if it's not just a part of the barrel), thread it and probably cut some off of the barrel (if the extension is threaded on) and rechamber it.
I would go with the GM blank and do a search here, I bought a bunch o reamers cheap from a member who puts them up for sale periodically. I dont know if he has a 357 sig though. If worse comes to worse I could chamber it for you (9mm) but you would have to be very patient on the time frame.