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Old 07-21-2013, 03:12 PM   #1
CharlyArmy
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Default PPS-43 7.62x25 conversion to 9mm NATO, lot's of pics

I have a PPS-43 Pistol that, of course, fired the 7.62x25 pistol round. With that ammo getting scarce and expensive, I decided to convert the gun to 9mm NATO.

I used a KP-44 barrel, and all the was needed was some minor modifications and it slipped right in. It uses the original bolt and magazines without any mods to them at all.

Here are the pictures of the process.

Original PPS-43 barrel on top, KP-44 barrel on bottom


First operation was to turn the muzzle down to .529 in order to slip into the muzzle brake.


Next was to reduce the diameter of the barrel on the chamber end and to reduce the thickness of the flange.


Last step was to mill the clearance for the barrel trunnion. Using a mill was nice, but this can easily be done with a hand file, which I used for the final touch up.


Completed barrel modifications.


Barrel has been touched up with cold blue.


Another pic of the flange. You can see the relief cut where the barrel and flange meet.


9mm rounds loaded in the 7.62x25 magazine. The rounds did not "walk" and all rounds fed without a problem. Magazines will hold 34 rounds.


9mm round in the unmodified PPS-43 bolt. Fits perfect. (Box of my reloads)


Barrel inserted into the trunnion.


Barrel assembled with the receiver.


KP-44 barrel is slightly longer than the original PPS-43 barrel, which is why the muzzle diameter needed to be reduced.


This pin is the only thing you need to remove in order to get the barrel out. Save it and reuse it.


Test fired 4 magazines thru this and not a single problem. A simple adjustment of the elevation was all that was needed. I removed the hinge pin between the upper and lower receiver and drilled it out to 1/4 inch. I'll use a bolt to hold them together. A bolt will allow me to separate the upper and lower for easier cleaning

Last edited by CharlyArmy; 07-21-2013 at 07:56 PM.
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Old 07-21-2013, 07:27 PM   #2
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Very interesting build man. I have to kits and want to change one to 9mm. Thanks for the post!!!!
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Old 07-21-2013, 07:39 PM   #3
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Bought the barrel here

http://www.gunpartscorp.com/Products/579660.htm
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Old 07-21-2013, 07:52 PM   #4
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IIRC, Someone used to sell a 9mm conversion kit in the early 2000's for the PPSH-41...
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Old 07-21-2013, 11:23 PM   #5
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Thank you for posting. Once my tokarev ammo runs out, this is what I will be doing.
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Old 07-24-2013, 12:32 AM   #6
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How much did you turn down the chamber end and how much did you mill off the back end?

Thanks for the the conversion!!!!
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Old 07-24-2013, 01:28 AM   #7
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Nice job man.
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Old 07-24-2013, 02:14 AM   #8
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been wanting to build one of these ever since I built my AK, where did you get your receiver or how did you make it?
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Old 07-24-2013, 08:41 AM   #9
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Quote:
Originally Posted by flashpoint08 View Post
been wanting to build one of these ever since I built my AK, where did you get your receiver or how did you make it?
I didn't build the gun, it is a Radom Factory pistol. I just simply changed the barrel.
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Old 07-24-2013, 08:42 AM   #10
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Quote:
Originally Posted by mojo00 View Post
How much did you turn down the chamber end and how much did you mill off the back end?

Thanks for the the conversion!!!!
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Old 07-24-2013, 09:05 AM   #11
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About how much time did you have in this project?
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Old 07-24-2013, 09:08 AM   #12
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Nice job. I just pulled apart a Radom pistol to add a barrel extension. Had I seen your thread I would have converted it to 9mm vs extending the x25 barrel. I threaded the front trunnion and used hex head cap screws to reattach the shroud. Makes for easy takedown.

I have a kit but not sure how much semi-auto work is needed to convert it. That I would do in 9mm.
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Old 07-24-2013, 09:31 AM   #13
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Good job Charly!

Quote:
how much semi-auto work is needed to convert it
Basicaly....semi bolt mod, trunnion, semi FGC, some free time and a few beers.
There is a guy on Weapons Guild that makes and sells drop in FCG, lots of build threads there as well.


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Old 07-24-2013, 11:27 AM   #14
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Quote:
Originally Posted by commiegun View Post
About how much time did you have in this project?
I'm guessing about an hour, give or take. Turning the barrel was my first project on my new lathe.
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