Anyone fire/own one of these?  There seem like lots of places to mount rails and new toys on this, but how does it perform?

I had one. Very cool gun. Handy, light weight,, etc. The top area o fthe grip where the web of your hand goes at, was very uncomfortable to me. Was too wide and square. My thumb knuckle would hurt a bit. If there was something to be done about that, I would have probably kept it. The 10 round mags didnt bother me in the least. Just carried 5 or 6 of them.

I picked up a USC this week and it's fun to shoot!  I also dyed it a maroonish color (which got some thumbs ups and thumbs downs) and got a bunch of mags.  I find holding the rifle lower on the handgrip keeps the safety switch from slamming into the web of my hand, and wearing flight gloves (or whatever you have handy) makes firing comfortable.  I hear the SW hi-cap conversion is out.  Has anyone tried it out?

Quoted: I picked up a USC this week and it's fun to shoot!  I also dyed it a maroonish color (which got some thumbs ups and thumbs downs) and got a bunch of mags.  I find holding the rifle lower on the handgrip keeps the safety switch from slamming into the web of my hand, and wearing flight gloves (or whatever you have handy) makes firing comfortable.  I hear the SW hi-cap conversion is out.  Has anyone tried it out?

I know nothing...  but you might want to read this thread before getting a conversion:

www.ar15.com/forums/topic.html?id=83968

Edited:
Oops, just noticed you posted in there. Got any pics of that maroon weapon? USC's are a little "different" anyway. I would like to see what that looks like if you don't mind. If you do, that's cool :)

I got more than one comment that my USC looked like a toy gun dyed maroon, and I felt that a real rifle has no business being mistaken as a toy, so I went ahead and dyed it black.  I did take some photos of it in maroon, but you might have to wait a little while for those to get developed.  I'll be sure to scan and post them though.