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 Anyone ever converted a USC to UMP? 
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Location: Airway heights
Joined: Sun Mar 20, 2011
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Real Name: Michael
So I picked up a USC and HATE the stock. I literally can't use the selector switch with my thumb and only having 10 round mags is dumb so I dropped another $1,053 on parts for what I thought was going to be plug and play well come to find out it isn't. So who's done one before? It's going to take some milling that I know.

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ANZAC wrote:
That one that says "From my cold dead hands..... will require a background check"


He who does not punish evil commands it to be done. --- Leonardo DaVinci

When its time to go in:
That place of steel and stone. I pray that you will keep me safe, so I will not walk alone. Help me to do my duty, please watch me on my rounds.
Amongst those perilous places and slamming steel door sounds. God, keep my fellow Officers well and free from harm. Let them know I'll be there too, whenever there's alarm.
Above all when I walk my beat, no matter where I roam. Let me go back whence I came, to family and home

Author unknown.


Wed May 12, 2021 8:15 pm
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Location: Mount Vernon
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There is a lot of videos and resources out there. Hkpro is what you seek. Use a dermel and go slow. Mine didn’t look pretty but the mags worked great. Do a form 1 and the barrel is a simple roll pin swap.

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Which is the better: a good friend, a good heart, a good eye, a good neighbor, a good wife, or the understanding of consequences? It is none of these. A warm and senitive soul which knows the worth of fellowship and the price of the individual dignity, this is best.


Wed May 12, 2021 8:38 pm
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Location: Airway heights
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wilmermj wrote:
There is a lot of videos and resources out there. Hkpro is what you seek. Use a dermel and go slow. Mine didn’t look pretty but the mags worked great. Do a form 1 and the barrel is a simple roll pin swap.


I want it threaded for a can so I am going to have it cut down.

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ANZAC wrote:
That one that says "From my cold dead hands..... will require a background check"


He who does not punish evil commands it to be done. --- Leonardo DaVinci

When its time to go in:
That place of steel and stone. I pray that you will keep me safe, so I will not walk alone. Help me to do my duty, please watch me on my rounds.
Amongst those perilous places and slamming steel door sounds. God, keep my fellow Officers well and free from harm. Let them know I'll be there too, whenever there's alarm.
Above all when I walk my beat, no matter where I roam. Let me go back whence I came, to family and home

Author unknown.


Wed May 12, 2021 8:56 pm
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Location: Redmond, WA
Joined: Sun Jul 22, 2012
Posts: 189
I’m in the same boat and looking to do a USC to UMP conversion. After a lot of research and running down the required three 922r parts, along with the 9mm conversion pieces.

I decided to go with the rear stub fuse route. I figured, if I am going to sacrifice a USC, I might as well get as close to a real UMP as possible. Not to mention it is an investment.

Take a look at the HKPro forum. There is a lot of helpful info and people.

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Thu May 13, 2021 6:24 pm
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From everything I've heard, this is the guy to contact.

https://www.tommybuilttactical.com/tactical/usc-to-ump-conversion


Thu May 13, 2021 6:47 pm
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Location: Redmond, WA
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NotAMerc wrote:
From everything I've heard, this is the guy to contact.

https://www.tommybuilttactical.com/tactical/usc-to-ump-conversion
TommyBuilt is highly recommended for conversions and he is my choice.

HDPS is another company that does conversions and makes 922r parts.

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Thu May 13, 2021 6:51 pm
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Location: maple valley
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NotAMerc wrote:
From everything I've heard, this is the guy to contact.

https://www.tommybuilttactical.com/tactical/usc-to-ump-conversion

I had Tommy convert mine, I'd definitely recommend him.


Thu May 13, 2021 8:09 pm
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