You know, I really like my USC (Grey). And I'm not going to go the UMP conversion either because of the excessive costs when the best you will get is an SBR. I have picked up extra 10 round mags and I may look at a mag clamp/strap but even in 10 round "mode" it is a pleasure to shoot and quick to reload. I am going to SBR, thread the barrel, and suppress, but that will be the extent of the conversion for me. As a right-hander, I am content with the fixed stock configuration. It is definitely a nice carbine to own (far more comfortable to shoot than my UZI with 16 rd mags).