I found one of the SD6 variants last year, think I payed 750$ for it with a nice custom cut case and 6 mags. There are a couple on GB, price only seems to go up as they become more and more rare. Fun little gun, I did a form 1 SBR, cut the barrel to about 2.5 inches and hid a real supressor inside the housing, yea there is a full length sparrow in there. Great range toy. Here is the only picture I have of it