Question on USC to UMP conversion
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Thread: Question on USC to UMP conversion

  1. #1
    jmn
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    Default Question on USC to UMP conversion

    Hello,

    I have a USC that I'm about to do the UMP conversion on. I bought a rear stub/folding stock combo (it already had the pin installed) and an FBI lower. From my research I thought that was all I needed. When I went to my LGS today and talked to the H&K armorer there, he said the stub would not work and that I needed the HDPS stock block. I went ahead and ordered a stock block but my question is, if the stub doesn't work for the conversion, what is it for?

    Thank you in advance.

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    The stub is for having it fuzed together with the USC receiver.

    Tom Bostic is your man for this conversion: https://www.tommybuilttactical.com/ump-conversions/

    The HDPS stock block is the "one and done!" approach. I've had my HDPS stock block for years and it works great.
    Last edited by Mr.Maim; 10-25-2016 at 01:03 AM.

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    The UMP rear stub is used for the conversion type where the rear of the USC receiver is cut off and the UMP stub is grafted on by plastic welding the receiver. Not everyone has the skill or experience to do this properly and it's just likely that your smith has no experience doing it. The stock block conversion is much simplier and doesn't require cutting and welding the polymer receiver, and probably is the only conversion he's familiar with.

    Just send your USC, lower, and UMP stub to Tom Bostic and he can do the job.

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    ^^ what he said. Search for TBostic UMP conversion.
    HK: No, that does not mean Hong Kong

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    jmn
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    Thank you very much guys. I will check out Tommy's website. I've had this rifle for about 2 years now and it's my favorite rifle. I'm excited to see what it will be like once I have the conversion done.

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    get the fused stub job done by tbostic!
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    See if you can find an ACR stock block and get an ACR stock. We hada GB here a few years ago.


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    I would not order the HDPS stock block and send your rifle and UMP rear stub to Tommy Built and have it done right. Also tell the HK armorer at your local shop he is a moron for me, K thanks! =)

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    To be fair, chopping off the rear of a USC and plastic welding a UMP rear on probably isn't something they teach at HK Armorers school, since it's hardly a HK approved modification.

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    Quote Originally Posted by dwillHK View Post
    To be fair, chopping off the rear of a USC and plastic welding a UMP rear on probably isn't something they teach at HK Armorers school, since it's hardly a HK approved modification.
    No part of a USC to UMP conversion is an HK approved modification.

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