Quoted:
Lately I have been considering the USC carbine and having it converted to the UMP. I have heard that these are now discontinued by HK and have dried up. Is this a bad idea now to get into one of these rifles? If I did get into one of these rifles would it be better to have it converted to the grease gun magazines or to accept the ump mags? I am fairly new to the HK rifles but would like to get a 45 in PCC and the HKs just look good.
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Can't argue with that.
The USC/UMP is what got me interested in the hk "platforms". I did some research, read the how to's, watched some videos, and decided that it wasn't in my budget to do the conversion and be able to feed it the more expensive 45 ammo.
At the same time I was purchasing a 9mm suppressor for my glock, and found a new clone builder on hkpro who was doing a number of different mp5 models for decent prices. Since I had a suppressor on the way, was already reloading 9mm, and momentarily felt $2000 burning a hole in my bank account I went with the sp89 pistol clone.
Sorry this doesn't help answer any of your questions.
I'd still like to wish you luck on doing the conversion. I doubt I'll ever get back around to doing one myself, but who knows...