Question on USC to UMP conversion - Page 2
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Thread: Question on USC to UMP conversion

  1. #11
    jmn
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    After checking out Tommy's website, I see he does great work and is highly recommended, but I cannot afford to have the fused stub conversion done. I ordered the stock block from HKparts.net and it should be here Friday.

    Renegade, that UMP looks very nice!

  2. #12
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    I am just starting down the same road with my USC45. My initial thought was to go with a fuse job but as you have discovered, it ain't cheap. I have emailed Tommy Bostic with a few questions and in the meantime, I'm researching different ways to be 922R compliant while using the chopped factory barrel. Whatever option I choose, I'll let Tommy do the milling and fitting.

  3. #13
    jmn
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    Hi meh92,

    For the 922R compliance, you can buy an American made USC magazine. I got 4 of them from HKparts for $50 each. From my inspection, they are just as well made as the German made magazines and are quite a bit cheaper. I haven't had a chance to try them out yet, but will do so once my conversion is finished.

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    PM Sent

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    Hi, all. I will soon be starting on a USC-to-UMP (.45) conversion. I will do the "basic" stuff myself (rail, change the guts of the lower, stock block, etc), but will be working with a local gunsmith for the machining bits. I do have a quick question for those more experienced here.

    When changing the lower, do I need the full lower (link to hkpart) or can I get a "stripped pistol grip" lower (link to hkparts), UMP lower backplate (link to hkparts) and stock block (link to hkparts)?

    Thanks in advance for any insight you can offer!
    Last edited by AmericaNL; 11-06-2016 at 09:31 PM.

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    Good question. I was wondering the same thing. Will the guts of my USC drop in to an FBI 2-position lower?

  7. #17
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    Yes they will, but you will need a UMP mag catch and likely a US-made trigger for 922r compliance.
    "The problem with socialism is eventually you run out of other people's money" ~ Margaret Thatcher

  8. #18
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    Thank you very much.

  9. #19
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    You will need to get the wider UMP mag catch pin (along with the mag catch), the USC is shorter. Also, grab an additional trigger housing pin. The UMP has an extra hole.

    You do not need the UMP backplate if you are using the HDPS stock block. It takes the place of it.

  10. #20
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    Quote Originally Posted by Renegade View Post
    No part of a USC to UMP conversion is an HK approved modification.
    True dat, most of what we do here at HKPro is not an HK approved modification.

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