I just got the mid-length profile barrel from Marty at Teppo Jutsu in 7.62x25. The parkerizing on the barrel was perfect and so was the fit as I installed all the necessary parts. I put the carbine together ASAP and went to the range. At first I had a little break-in problem with the ejector being just a hair too high up against the bolt but that was easy to correct. I had loaded 25 rounds in 4 PPS-43 magazines (they actually hold 32 rounds) and after the little minor problem at the very beginning, I went through all 4 mags without a hitch. My only complaint was I only brought 100 rounds of ammo and went through it in nothing flat!
This is my 7.62x25 carbine -- I tried to keep it light so there is nothing fancy.
This is a picture of a 9mm round next to a 7.62x25 round just to show the difference in size.
picture showing the 7.62 block's ejector further back compared to a Colt block ejector.
looking down at the 7.62 magblock (top) compared to a Colt type block. Notice the ejector is back in the pocket of the AR magwell on the 7.62 magblock.
The front and rear blocks with a PPS-43 mag in the middle.
Sheet metal box needed because the PPS-43 mag is narrow and is a sloppy fit in the AR magwell.
This could be made bigger and attached to both the front and rear pieces to make a single magblock.
This is the rear piece showing the ejector (from Brownells) and the groove for the ridge on the rear of the PPS-43 magazine.
Please keep in mind this was all a prototype and the parts are a little rough but since they worked great I decided not to go any further -- dont' fix it if it ain't broke!