I just received a Stormwerkz folding mechanism in the mail today. I've never used a folding mechanism before, but after reading complaints about the wobbliness that tend to afflict some ACE folders I decided to go with the Stormwerkz folder since it seemed like a better design. It was a smidge cheaper than the Ace too, that also helped the decision. Aside from the fact that the dark purplish finish doesn't really match the rest of the gun, it seems like a really solid piece and locks up tighter than a male bovine's posterior orifice.
Anyway, I have mounted the folder to a CSS receiver bloc