Call up Lee and they give you new decaping pins plus a few extra. One of mine broke on like round 45 and they sent me 3.
I got a little more of the bolt done today. I still need to: square up and deepen the front of the slot for the hammer; fit a fireing pin return spring; and a fireing pin retaining screw. I made the slot by drilling some 13/32" holes and hacksawed/filed out the slot. It took about 2 hours. Heres a before and after.
can i post?
"NA BEAN DON CHAT GUN LAMHAINN"
Sure, Just keep in mind its not done yet. What I've done so far is based off of the SGN article with a few changes.
I was re-reading the SGN article and looking at the ar15 fire control parts, firing pin and recoil spring and I got to thinking about another possible direction for this build. The ar15 9mm bolts and barrels are expensive compaired to a 223 bolt and barrel. The Suomi bolt can be turned down small enough to fit in an AR15 upper. The difference in lenght of the two bolts from the back of the firing pin to the front of the bolt is only .030" The differences being in the lip that protrudes past the bolt face. One problem that I see is that .450" of the AR15 bolt goes into the barrel extension so to use the ar15 firing pin set up you would have to recess the 9mm barrel in the same fashion to get the correct angle of the hammer striking the firing pin. I suppose you could just make a barrel bushing modeled after the ar15 barrel shank with a built in feed ramp of sorts. The Suomi mags and drums won't fit an ar15 magwell. but a modified sten mag will. The bolt would have to be modifed for the ar15 firing pin like the SGN-9, and a key added like the ar15 bolt so you could use the charging handle; the barrel bushing made (and barrel extended); and the magizines modified. Perhaps less work than the SGN-9.
I got a little more work done on the bolt. The front of the hammer slot has been squared up and the 8-32 firing pin retaining screw installed. Heres a picture with the firing pin installed. I'm going to try and use an inertia firing pin as I set the hammer .050" off of the firing pin at its full forward fired position. About .065" of the firing pin head sits out of the bolt body in the unfired position for the hammer to hit. If it doesn't work I'll keep trimming the front of the hammer slot until I get good primer hits.
Prexis is offering a ready made bolt with the firing pin installed for their Suomi semi only receiver.
The Prexis semi bolt counts a a US made part for $215, and they will also will modify your bolt for $120. The SGN-9 article said it took the guy about 8 hours total on just the bolt and I'm well on the way there. I'm going to try to make or modify all of the parts myself for this build. Today I got the feed lip squared to the bolt face and will try to get a picture of it up tomorrow some time.
Last edited by moleman; 05-08-2008 at 09:54 AM.
if sombody scans the SGN artical I would like to have a copy of it. all of the racks were empty in all of the stors that I know carry SGN.
please and a big thankyou