What barrel/mag to use for 9mm conversion
I have a friend who's really interested in a 9mm AK. We figured out to use a 74 kit for bolt & trunnion, but I'm not sure what to look for for barrels and magazines. I realize we will probably have to sleeve the barrel to fit the trunnion, but what barrel should we look for (ie cheap & readily available... 16" is a plus, but we can always weld on an extension)? Any hints from experienced 9mm builders?
9mm & .357 Calibers, 5/8" Outside Diameter, 17-3/4" Long, 6 Groove, 1 Turn In 16"
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Thanks for the great info and links! So, quick calculation in my head is that 5/8" is about 15ish mm, so it would have to be sleaved to the AK trunnion which, IIRC, is 22mm standard. I assume this would be an easy and cheap task for a machine shop.
Is the Suomi barrel thicker than an AK? If so, how much? I'm thinking a sleeve might be easier than turning down a suomi barrel and adding an extension. Am I correct?
One more question... is headspacing needed on a straight blow-back design? My guess is no, but I want to make sure.
No Hope For Me
Suoami barrel smaller OD than a 23mm euro ak trunion will need a sleave
Originally Posted by 1biggun
I think the best bet is going to be to get a barrel blank from Numrich and have it chambered and sleeved.
The best combo is a mini uzi bbl and soumi mags. CDNN used to have the barrels, 19" long 5/8od and chrome lined, but they sold out some time ago. The chamber is a bit short, but if you cut the bolt face about .010 deeper it should work fine. Look around on an uzi board you might get lucky and find a used one. The bbls from GPC say they are for 357 or 9mm, I would call and ask, bu Im sure they are 357 not 355. The soumi stick mags are a great deal they are cheap in great shape, reliable and very easy to load, and the stock mag release just has to be slightly extended to make unmodified mags lockup. I would advise you to stay away from the drum mags. They look cool, but are a pain in the ass. First of all they are big, heavy and cumbersome. You will have to cut way into the receiver to get them to fit, and then you will have to reinforce the areas you cut to stiffen it up again. You cant get a standard folding stock to work with a drum in place, a modified wire or AMD stock might work but not a solid composite. Drums area also a pain to load compared to sticks, to much fumbleing and winding. They also have to be fitted to your gun so that they dont rattle excessivly, (fileing and grinding). Drums are also expensive, you can get two 32rd mags for $16 a 72rd drum will cost you 25-30. You will also have to slim up the push lug on the bolt to make it clear the narrow lips of the drum, but not for the stick. Just use sticks you will be better off. As for the bolt, the best one I have found is a 223. You will have to open it up a bit to make the 9mm fit, but at the same time you can cut the face a bit deeper to make it work with the uzi bbl. The best thing about the 223 bolt is that because the extractor and firing pin holes are at different angles than on the 7.62x39 bolt, it is possible to weld the bolt to the carrier and still be able to remove the extractor and firing fin without drilling holes in the carrier.
Originally Posted by PAC762
Headspacing (for our purposes) is the measurement of how deeply the loaded (unfired) cartridge "seats" itself into the chamber.
Proper headspace will put the barrel and bolt together at the closest possible tolerance for safety, while accounting for the bullet seat at the throat, and the built-in tolerance for case expansion.
While it is still the small 9mm, it could still rupture a cartridge. While not as bad as say a ruptured .308 round, it is still bad.