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In my personal opinion HDPS makes the best, as they are solid metal:

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

$195

I own two and they were as perfect fit as you could get, but he is currently out of stock.


As a second option, there are Top Notch Parts ones:

http://www.top-notchparts.com/prod01.htm

$115

I have handled but not owned these and they are a tiny bit less sturdy based on the build, but would buy one. Many folks here say they are very happy with the Top Notch parts.

I have bought parts from both companies in the past without issue. Ed (HDPS) is somewhat easier to get ahold of.
 

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I think the TN stock block is designed to use the TN folding stock only (which can count as a compliance part on a non-SBR), and not the HK folding stock. If I remember right, the hinge/pin on the TN folding stock is larger.

There are really only two people doing USC/UMP conversions right now, I used TN and am happy with the build quality, but the turn-around time was crazy (13 weeks) and Wade at TN doesn't have e-mail, just a phone number. Ed at HDPS is a bit easier to get in touch with.
 

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Cool links. Top Notch will even kill your USC (for a fee of course). Here's their "Discription" of services available: "INSTALLATION AND DYING OF USC"
 

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TBOSTIC makes what looks to be a great conversion block for the SL8, but requires extensive cutting of the receiver; but gives a great G36 look to the finished product.
I dont think he make one for the USC, but I have been wrong about many things in the past. I think he might have made a catch? for the folding stock on the UMP/USC if I recall, to hold it in place when folded.
He is a member here you might try sending him a PM in case he doesn't see your posting.
 

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Just to clear up a few things since i am looking at parts for a conversion. The Top Notch block doesn't allow the fit of the UMP stock? Is there a big difference between the TN US folding stock and the HK UMP stock?
 

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I think the TN stock wasn't that far off. Jeff at TE did some modifications to get the TN stock to fit his block, which was designed to fit the factory stock.

http://www.tacticalexcellence.com/TNstock.html

Another difference between the TN and other setups is the lower rear pushpin setup. The TN setup clips the rear of the UMP lower and uses an externally accessible pushpin that allows the lower to swing away without removing the big screws holding the stock block onto the receiver first. I believe on the HPDS , like the TE , the pin holding the rear of the lower to the stock block is covered by the the receiver and you have to remove the rear screws to allow the lower to swing away. However, you don't have to clip the rear of the lower.

Mine was done by TN and I'm happy with it.
 
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