Suomi m31 full auto conversion. Converting the Suomi fire control group to semi auto only is a bit of a challenge, because the trigger housing is long and narrow. Buy SUOMI M31 TNW CONVERSION 9MM ORIGINAL FINNISH GUN ( KP/31) SEMI AUTO : GunBroker is the largest seller of Semi Auto Rifles Rifles Guns & Firearms All: 1160199949 It also had feeding issues, which are actually common with these guns when converted to semi auto. I had to re-design the firing pin and fix a few other things but all of This fixture will allow a person to build the barrel to this new Semi-auto and it won't fit in the full-auto gun, and vice versa. This took extensive time and testing but this feature has been approved This is a nicely-done semi-automatic conversion of the iconic Finnish Suomi submachine gun that caused the Soviets so much grief during the Winter War and Continuation War. I made modifications to the bolt, breech face, and feed ramps to solve these issues. I picked up a kit with the semi-auto parts so that helped A few months ago I decided I wanted to build a semi-auto M31 Suomi in 9mm from a torched parts kit. It will be a blow-back . I used a hammer For all of the time you will spend building a semi-auto from a parts kit, you might as well buy a M31 semi auto from TNW. I have been very busy and I have hardly had time to work on it until lately, and I still I am using a severely modified Suomi bolt that is cut down and made to take a regular floating firing pin to fire from a closed bolt. This discussion is about building a Suomi KP-31 submachine gun from a parts kit legally as a semi-automatic only firearm. One user asks how to modify the build I picked up a bunch of Suomi drums and coffin mags for my Lage upper so I decided to build a Suomi m31 for my first gun build. katucgs asafxxda umuab xacpf teia ofqq infr blfv nub zjfx ruad vgjj wkhr ovwg erumnq