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Thread: What barrel/mag to use for 9mm conversion

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    Gunco Member PAC762's Avatar
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    Default What barrel/mag to use for 9mm conversion

    Hey guys,
    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?
    Thanks,
    PAC

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    Happy Camper hcpookie's Avatar
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    "yes".

    Here's what I would consider - buy a $20 Suomi kit and a few mags from CFS. Other mags can be dug up elsewhere, but the Suomi stuff is pretty cheap right now.

    Take the barrel out of the Suomi and discard (or sell) the rest of the kit. Now you've got a barrel blank that you can thin down on a lathe, put on a barrel extension, and you're good!

    Suomi mags will need to have a locking lug welded on, or you could make a "magazine well" to engage them in the receiver. Either way, the mags won't simply lock up without a bit 'o' work. It would be best to use a magazine well so you only have to touch 1 part instead of welding on 10-20 magazines.

    Mags, I would also look PPSH mags. I think they will work with some refitting...

    PPSH barrels can be had for about $40 but they too require a barrel extension.

    I've looked for carbine-length 9mm barrel blanks and can't find any. I can find .358 barrels but none listed as "true" 9mm barrels.

    Here's a thought - I haven't pursued this - the Uzi guy that makes barrel conversions for the Uzi may be able to make something. It would require sleeves to fit, but would be the proper length. If I remember correctly, it is barrelxchange@aol.com - let me confirm... yep it is. He can be found on uzitalk.com as well...
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    Gunco Veteran panaceabeachbum's Avatar
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    Happy Camper hcpookie's Avatar
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    Nice!

    http://www.e-gunparts.com/DisplayAd....rSuperSKU=&MC=

    9mm & .357 Calibers, 5/8" Outside Diameter, 17-3/4" Long, 6 Groove, 1 Turn In 16"
    Model:
    Item No. 584090
    Additional Additional Shipping charge: $1.00
    Retail Price: $24.85
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    http://pookieweb.net


    The "original" Boltcutter Rivet Squeezers:
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    Project Pink - the Pink and Blue AK-74:
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    Gunco Member PAC762's Avatar
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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?

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    Gunco Member PAC762's Avatar
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    One more question... is headspacing needed on a straight blow-back design? My guess is no, but I want to make sure.

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    No Hope For Me 1biggun's Avatar
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    Suoami barrel smaller OD than a 23mm euro ak trunion will need a sleave

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    Gunco Member PAC762's Avatar
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    Quote Originally Posted by 1biggun
    Suoami barrel smaller OD than a 23mm euro ak trunion will need a sleave
    OK. Thanks!

    I think the best bet is going to be to get a barrel blank from Numrich and have it chambered and sleeved.

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    Gunco Rookie TXaggie's Avatar
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    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.

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    Happy Camper hcpookie's Avatar
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    Quote Originally Posted by PAC762
    One more question... is headspacing needed on a straight blow-back design? My guess is no, but I want to make sure.
    "YES"

    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.

    FWIW.
    Gunco Member #10

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    The "original" Boltcutter Rivet Squeezers:
    http://pookieweb.net/AK/rivet/boltcutters/boltcutter.htm


    Project Pink - the Pink and Blue AK-74:
    http://pookieweb.net/pink/pink.htm

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