There's one at Wade's Eastside Gunshop and Indoor Range in Bellevue, WA. It's been getting pounded mercilessly without being cleaned. I haven't heard of a malfunction yet, and it shoots like a rifle! (I've shot it. It had 650 rounds through it and was uncleaned at that time. It ran great!)
Here's a link I was shown also...
It's a thread on Tactical Forums about the new Detonics USA gun.
http://www.tacticalforums.com/cgi-bin/tacticalubb/ultimatebb.cgi?ubb=get_topic;f=56;t=001078
Hope this helps! ...Deeton