10mm USP tactical underway - Page 4
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Thread: 10mm USP tactical underway

  1. #31
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    Quote Originally Posted by drewcog View Post
    Interesting project. Probably next on my list if it works out once your done and report back. Can someone fill me in on why the factory 40S&W barrel can't be reamed? Also, if EFK isn't making the barrel any longer, what are my options? Don't need threaded...
    Something about being too hard to ream, the reamer just chatters.

    There's a couple of us that have contacted RCM about a run of USP tactical 40 barrels that they make being opened up to 10mm.

    I'd love to get one hardened and coated correctly.

  2. #32
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    love the 10mm

  3. #33
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    I have a spare .40 barrel if anyone wants to try

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  5. #34
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    Quote Originally Posted by scubadds View Post
    I have a spare .40 barrel if anyone wants to try
    Send it my way! I was about to buy one to test this carbide reamer on. Also what date code is your USP 40 slide? I fitted a KE code USP 40 slide to my USP 45 tactical frame and the trigger only works if you pull back slightly on the slide. I think a washer in the recoil assembly would fix this but I'm surprised you haven't had this issue

  6. #35
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    Update: spacing with a brass washer allowed me to fire without holding the slide back slightly, however after racking the slide hard it must be pulled back slightly again for it to function. When you get a chance, can you take a picture of the bottom of both your 40 and 45 slide side by side? And post the date codes of each

  7. #36
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    Had a farm work day and got to shoot a few rounds... literally a few
    So, I am not sure I grabbed the correct magazine (all my usp .45 mags got mixed together and I left in A hurry) as I had most rounds want to nose over the barrel. I tried an unmodifird mk23 mag and it did not work either
    So a minor set back today. But I really think it's a simple fix to get the bullets to not point upwards as much as they do in the mag
    As I said earlier, the thinner 10mm bullet points up as the feed lips are to wide

  8. #37
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    Quote Originally Posted by chune View Post
    Update: spacing with a brass washer allowed me to fire without holding the slide back slightly, however after racking the slide hard it must be pulled back slightly again for it to function. When you get a chance, can you take a picture of the bottom of both your 40 and 45 slide side by side? And post the date codes of each
    Will do...

  9. #38
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    Quote Originally Posted by scubadds View Post
    Will do...
    Figured out my problem, KE date code slides are no good for this conversion. What are the odds my police trade in would be the ONE YEAR that doesn't work?? Anything after KE should be fine.

  10. #39
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    Just a heads up to anyone else tackling this, Michael's Machines will be producing a limited run of 10mm USP barrels. If you are interested add your name to this thread: https://www.hkpro.com/forum/michael-s...your-slot.html

  11. #40
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    Sorry I lost my steam on this...
    I will pick back up....I got Roller Lock Fever....

    Does anyone have a .40 jet funnel mag that they can try a 10mm bullet in?
    It would be ideal if Hk went to metal mags for .40 Jet Funnel, like they did with the 9mm...
    I was thinking that the plastic might be thinner on the .40 jet funnel mag and the 10mm might just fit???
    Otherwise, I will try to work on bending a Mk23 mag feed lips for the project....

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