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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 03-09-2012, 3:13 PM
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PatientCone PatientCone is offline
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Default HK USC to UMP conversion

I have an HK USC laying around that sorta bores me, so I figured why not see what it takes to do the UMP conversion. I just wanted to ask those who have done it, what it all entails. I have searched a little on the web and hkparts to get some basic information. Any little tidbits of information would be much appreciated, my USC is completely stock. I would like this to be a high-quality conversion.

http://www.hkparts.net/shop/pc/HK-US...Parts-c229.htm

^that is some basic info.
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  #2  
Old 03-09-2012, 8:35 PM
azthig69 azthig69 is offline
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Quote:
Originally Posted by PatientCone View Post
I have an HK USC laying around that sorta bores me, so I figured why not see what it takes to do the UMP conversion. I just wanted to ask those who have done it, what it all entails. I have searched a little on the web and hkparts to get some basic information. Any little tidbits of information would be much appreciated, my USC is completely stock. I would like this to be a high-quality conversion.

http://www.hkparts.net/shop/pc/HK-US...Parts-c229.htm

^that is some basic info.
Start here http://www.ar15.com/forums/t_6_9/362442_.html

or here http://www.hdps.org/htm/3.htm

or here http://www.hkspecialiststore.com

or here http://www.centermassfirearms.com/pa...usc-parts.html

Hope this helps.
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  #3  
Old 03-09-2012, 8:44 PM
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Start with an USC and pocket full of money...watch as money disappears...and effort = you get a UMP. IMO add about $1500 to get everything you need.

hkparts folks are good people and very helpful.
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  #4  
Old 03-09-2012, 9:32 PM
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UMP is actually one of the easier HKs to convert. The hardest part really is to get the vent slots cut and the UMP lower frame pivot radius enlarged to fit the larger 6mm pivot pin.

HDPS.org does great work although I'm not sure how his schedule is like nowadays.
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Old 03-10-2012, 6:25 AM
azthig69 azthig69 is offline
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Quote:
Originally Posted by PatientCone View Post
I have an HK USC laying around that sorta bores me, so I figured why not see what it takes to do the UMP conversion. I just wanted to ask those who have done it, what it all entails. I have searched a little on the web and hkparts to get some basic information. Any little tidbits of information would be much appreciated, my USC is completely stock. I would like this to be a high-quality conversion.

http://www.hkparts.net/shop/pc/HK-US...Parts-c229.htm

^that is some basic info.
Now here's the low budget way of just gettin the UMP look.

http://www.firearmstalk.com/forums/f...-anyway-34470/

Then buy Promag USC magazine for 922r compliance and call it a day.

http://www.cheaperthandirt.com/31028709-1.html

BTW, just lettin you know, there's a UMP mag shortage and if you find one, will cost you ~$125-$150.

Cheers.
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  #6  
Old 03-10-2012, 6:29 AM
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I looked into it and id $1500 is a low estimate. Just do a grease gun conversion. You can get the folding stock, lower, 32 rd mags (iirc) for around $500.
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  #7  
Old 03-10-2012, 11:43 AM
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After my head stopped spinning at the cost of a UMP conversion, I went with the Grease Gun conversion. I already had several GG mags on hand which made the decision easier. dan12580's estimate is right on the money if you switch your FCG parts into the GG lower. I wanted to switch back and forth, so I paid a bit more. I dyed the receiver and milled the handguard vents myself, saving a few more bucks, although the vents aren't required.

Before:


After:

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