In my own experience with one of their "stock cocker" body kits. The fit and finish were nice. I agree with Cunha's post there, insomuch as what is "available today".
I think what rather upset me was they advertise it as being "stock" and yet the tolerances required that I change timing rod length, cocking rod length, and slim the bolt down to properly operate, among other tweaks from "stock". I guess that manner of thing could be expected from any after market kit, but it sure would have been nice to know BEFORE ordering a bunch of parts and then having to go buy different stuff.
As far as pneumatics and other parts, I opted to go more tried and true old school.