10mm USP tactical underway
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Thread: 10mm USP tactical underway

  1. #1
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    Default 10mm USP tactical underway

    Had to try it; following Lifesizepotato's lead on this one
    Found a used USP .40, contacted EFK and got one of the last USP .40 threaded barrels in stock (she said they were not making any at the moment)
    Have a 18# recoil spring in hand
    Bought two STI 140mm .40 mags
    Jet funnel arrived


    I plan to test the .40 barrel once I get the gun in my hands...shoot it a 20-30 rounds or so to test reliability before I ream the barrel.

    Then send the barrel to ream to 10mm; (open to suggestions on who to do that service?)

    If this all works as I hope; I plan to open the ejection port up (Its been done before, but I can't get any decent pics to show what they did)

    If it runs flawlessly, I will go ahead and remark as 10MM tactical and maybe mill for RMR (I can't recall who the go-to was on the USP, L&M or Ashbury??)



    I also have a MP5 10mm project underway; should make for a nice combo

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    Can't wait to hear how it turns out! Have you put the jet funnel on to see if those mags are long enough to work with it?

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    I don't have the gun in my hands yet; it was delayed in getting shipped out....
    The guy that reamed yours in no longer taking new business....

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    AGG
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    Interesting projects--- please keep us updated on each!!!

    Tony

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    Quote Originally Posted by scubadds View Post
    I don't have the gun in my hands yet; it was delayed in getting shipped out....
    The guy that reamed yours in no longer taking new business....
    Oh, bummer! Well, barrel reaming is a pretty easy and common thing, the only trick is finding someone with a 10mm reamer. You might check around with local smiths.

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    So, I just ordered the parts (reamer, handle and go-gauge) from Dave Manson Precision Reamers; He talked me thru the process. Seems pretty straight forward.

    Now I need to figure out how to change the .40 S&W (Short and Weak) markings to .40 L&H (long and hot)... :)
    Last edited by scubadds; 11-09-2016 at 06:34 PM.

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    That will be sweet. 10 mil is fun to shoot!

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    I'm looking at the same project. Joined today for the info, and my new appreciation for HK. There's a member threatening to do a group guy on barrels for these conversions in another thread, FYI, though he hasn't updated which the pricing for the past two weeks. Hope he comes through.

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    im tackling this project as well. Any update from you scubadds? Here is a picture of a usp 40 w/ jet funnel and STI 140mm mags:
    10mm USP tactical underway-usp40sti140mm.jpg

  11. #10
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    Sorry to not have followed up

    I ditched that method...The STI mags don't hold the slide open on the last round....

    I reamed the .40 barrel myself, opened the ejection port so it ejects a live round. Put the 18# spring in...

    Then put the slide on a .45 tactical lower and used the .45 magazine with a slight bend in the feed lips

    I have put about 15 rounds thru it (need to chrono my 10mm rounds before I reload more)

    Seems to function 100% as it should...
    The ,45 frame is about 3mm longer than the .40 slide...
    I plan to retest, and purchase a .45 frame trim it to fit; and remill the slide for 10mm tactical markings...

    I will follow up with a real post with the results....10mm USP tactical underway-10mm.jpg

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