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Posted: 12/16/2020 8:46:53 PM EDT
Ok, so the last thread got archived, but I finally found a used USP40 fullsize. I bought it as an impulse, (I'm weak) and figure I'll build me a 10 mm.
I know a few of you guys have done it, and I need some guidance. Iirc, the "go to" magazine was for an STI 2011, with a little tweaking. At the time of the last thread, there was no clear cut source for a new barrel, and I seem to remember that not too many smiths wanted to destroy a good reamer, on an HK barrel, I just don't remember the solution... I'd post a pic, but A. you all know what it looks like, and B. THE GODDAMNED NICS COCKSUCKERS DELAYED ME AGAIN!  Guess I gotta get a UPIN.  @spartacus2002 
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Posted: 12/16/2020 10:23:09 PM EDT
[#1]
I think the fix was to buy an aftermarket .40 barrel that wasn’t so hard to ream. I think @mjohn3006 is the guy who has reamed many a .40SW barrel into 10mm? He may be able to advise on reaming it yourself.
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Posted: 12/16/2020 11:27:15 PM EDT
[#2]
Thanks.
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Posted: 12/17/2020 3:31:50 AM EDT
[#3]
There was a guy on HKPro who had a long running thread about converting his USP 40 to 10mm.
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Posted: 12/17/2020 6:48:28 AM EDT
[#4]
Yeah I did it. Get a KKM.40 barrel. I used this to team it to 10mm: https://www.brownells.com/gunsmith-tools-supplies/barrel-tools/reamers/centerfire-reamers/pistol-chambering-reamers-prod17655.aspx
Para mag sticks out the bottom funny and you have to cut a notch for the mag catch and it’s tricky and you have to smooth out the notch or it messes up the mag catch on the gun. Honestly, I did it. It works. But it was the least fun of the many conversions I’ve done. I shoot the gun in 10mm kurtz (.40s&w), mostly. |
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Posted: 12/18/2020 7:12:15 PM EDT
[#5]
Quote HistoryQuoted: Yeah I did it. Get a KKM.40 barrel. I used this to team it to 10mm: https://www.brownells.com/gunsmith-tools-supplies/barrel-tools/reamers/centerfire-reamers/pistol-chambering-reamers-prod17655.aspx Para mag sticks out the bottom funny and you have to cut a notch for the mag catch and it’s tricky and you have to smooth out the notch or it messes up the mag catch on the gun. Honestly, I did it. It works. But it was the least fun of the many conversions I’ve done. I shoot the gun in 10mm kurtz (.40s&w), mostly. Well, I was able to pick it up today, so I had to pay panic price for 2 boxes of .40cal. (Just to check it out, used gun) Came with 3 mags (1 is a 10 rounder ) and a Safariland paddle holster. Holster is a soft kydex (?) Lined with leather maybe? Hybrid? I dunno. Thanks, @mjohn3006. I looked at kkm and they dont offer anything for an HK . Which barrel am I looking for? Also, I dont have access to a machine shop, how exactly are we talking about reaming this? Thanks. |
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Posted: 12/18/2020 8:41:12 PM EDT
[#6]
Quote HistoryQuoted: Well, I was able to pick it up today, so I had to pay panic price for 2 boxes of .40cal. (Just to check it out, used gun) Came with 3 mags (1 is a 10 rounder ) and a Safariland paddle holster. Holster is a soft kydex (?) Lined with leather maybe? Hybrid? I dunno. Thanks, @mjohn3006. I looked at kkm and they dont offer anything for an HK . Which barrel am I looking for? Also, I dont have access to a machine shop, how exactly are we talking about reaming this? Thanks. Weird. I know my barrel is KKM. Pretty much any aftermarket non HK barrel should work. Put new barrel in and shoot it with .40(aka 10mm kurtz) to ensure function. I put the barrel in a vice, I have a reamer handle and use metal cutting lube. Put a .40 in it and see where it sits. Spin the reamer by hand, cleaning out the shavings from time to time. Keep putting a 10mm round in and seeing how low it gets. Keep going until it sits where the .40 did. Then function check. It sounds half ass I know. But I’ve converted several guns and they all work great. |
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Posted: 12/18/2020 10:11:33 PM EDT
[#7]
Quote HistoryQuoted: Weird. I know my barrel is KKM. Pretty much any aftermarket non HK barrel should work. Put new barrel in and shoot it with .40(aka 10mm kurtz) to ensure function. I put the barrel in a vice, I have a reamer handle and use metal cutting lube. Put a .40 in it and see where it sits. Spin the reamer by hand, cleaning out the shavings from time to time. Keep putting a 10mm round in and seeing how low it gets. Keep going until it sits where the .40 did. Then function check. It sounds half ass I know. But I’ve converted several guns and they all work great. Got damn, son! I love it!  |
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Posted: 12/18/2020 10:14:19 PM EDT
[#8]
Quote HistoryQuoted: Got damn, son! I love it! Quote HistoryQuoted: Quoted: Weird. I know my barrel is KKM. Pretty much any aftermarket non HK barrel should work. Put new barrel in and shoot it with .40(aka 10mm kurtz) to ensure function. I put the barrel in a vice, I have a reamer handle and use metal cutting lube. Put a .40 in it and see where it sits. Spin the reamer by hand, cleaning out the shavings from time to time. Keep putting a 10mm round in and seeing how low it gets. Keep going until it sits where the .40 did. Then function check. It sounds half ass I know. But I’ve converted several guns and they all work great. Got damn, son! I love it! Hell yeah. In case you don’t know what I’ve done Ruger super red hawk to 10mm magnum Taurus 405 to 10mm S&W 4013 to 10mm S&W 4053 to 10mm S&W CS 40 to 10mm AMT backup .40 to 10mm USP to 10mm Mauser M2 to 10mm |
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Posted: 12/18/2020 11:30:35 PM EDT
[#9]
You're a madman! You did all these by hand?
Not even a drill press? |
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Posted: 12/19/2020 12:27:12 AM EDT
[#10]
Quote HistoryQuoted: You're a madman! You did all these by hand? Not even a drill press? Correct The revolvers were the worst. Reaming all the chambers |
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Posted: 12/23/2020 10:42:09 PM EDT
[#11]
A usp 10mm?
A singularity opens....... |
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Posted: 12/23/2020 10:58:51 PM EDT
[#12]
I am just gonna throw this turd into the punchbowl:
1. I have fired a USP45 with 45 super, which (at the same bullet weight) is mass x velocity identical to real 10mm from Buffalo Bore and/or underwood. 2. I have fired a USP40 with hot 40SW ammo, which approaches real 10mm velocities. 3. Neither was pleasant. In fact, the 45 Super was punishing. 4. While a 10mm USP sounds great on paper, real 10mm is best employed in a heavy, metal-framed pistol. |
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Posted: 12/29/2020 2:28:46 AM EDT
[#13]
Quote HistoryQuoted: I am just gonna throw this turd into the punchbowl: 1. I have fired a USP45 with 45 super, which (at the same bullet weight) is mass x velocity identical to real 10mm from Buffalo Bore and/or underwood. 2. I have fired a USP40 with hot 40SW ammo, which approaches real 10mm velocities. 3. Neither was pleasant. In fact, the 45 Super was punishing. 4. While a 10mm USP sounds great on paper, real 10mm is best employed in a heavy, metal-framed pistol. I'm sure that's true. At the same time, I think a USP45C with .45 Super sounds like a great thing to carry around. Insert the cat reading the paper pic here. |
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Posted: 12/29/2020 6:19:20 PM EDT
[#14]
Quote HistoryQuoted: I'm sure that's true. At the same time, I think a USP45C with .45 Super sounds like a great thing to carry around. Insert the cat reading the paper pic here. The USP45C isn't rated for the .45 Super like the full size gun is. |
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Posted: 12/29/2020 6:38:14 PM EDT
[#15]
Quote HistoryQuoted: The USP45C isn't rated for the .45 Super like the full size gun is. Quote HistoryQuoted: Quoted: I'm sure that's true. At the same time, I think a USP45C with .45 Super sounds like a great thing to carry around. Insert the cat reading the paper pic here. The USP45C isn't rated for the .45 Super like the full size gun is. I didn't think any of them were officially rated for .45 Super? |
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