I don't want ot get involved in the relative strength merits of the small ring vs large ring actions. Couple that with a slug a few thousandths over groove and you may stress something. Some load data shown for the 7.62x39 shows pressures in excess of 52K. Especially not in an older small ring action. 300x.308 I do not recomment you shoot any surplus or factory ammo loaded with. The raised metal from this caused the bolt to drag so I had to polish off a bit of the face of the left (long)lug. On the breechface in 1/16' numbers it is stamped 7.62x39. The barrel I got from Gun Parts was very tightly chambered. I jeweled the bolt, added the rear apurture sight and MiG welded on a new bolt handle. You have some welding and grinding ahead of you. I made no mods to the extractor as it works fine, yours may not. The extension finger prods it out of the boltface earlier so it clears through the ejection port without issue. The shorter one can rebound back into the action, or get sideways jammed under the action bridge. It's originally designed to eject the much longer 7x57 case. That takes care of that.Īnother modification I recommend is an extension on the ejector (see photo). Drill and countersink a hole through the rear of the magazine housing and simply screw in a wood screw. It WILL move forward under recoil and tie up the ammo/follower. The supplied plastic one works great, it just went against the grain. I then soldered on a piece of brass to take up the windage between the original 7x57 and the smaller 7.62x39 case OD's (30 Rooski Shortski).

I didn't like the plastic follower so it got tossed and I cut down the original steel one. Finally the spacer block was simply a mildly shaped piece of white nylon. Tee other parts in the kit (Follower) was plastic, and the spring was simply the spring out of a magazine body (apparently). Superbly! I shoot cast 90% of the time and this thing was a shooter, par excellance. And VERY unexpectedly was the way it shot. I turned out the whooptie on the barrel so that problem was gone. Second was that while the grooves appeared nice and smooth, the lands looked like they had sawteeth! There was this small whooptie halfway along the length. One starting at the muzzle and the other at the breech.

One was the contour looked like it had been done by 2 guys. When I got the kit I was disappointed in the barrel for 2 reasons. I built one on a 1894 Brazilian contract small ring action made by FN.

Spanish mauser 7.62x39 conversion