I just got my XCR courtesy of a fellow gunnutz... Now, I'm a bit annoyed by the upper that does not open enough for cleaning the interior of the rifle... Add to that the fact that the front pin does not easilly come off and you get real cleaning problems... My guess is that a bit of grinding/filing of the upper will solve that problem by allowing the two parts to open wider.
Another thing that I find annoying is that my rifle is equiped with the old style gas regulator... Robinson state that all their rifles produced from 2007 on have the new style... Well, I hope I can buy a replacement kit from Robinson (already ordered one, We'll see...)
The rifle is heavy, probably mostly from the 18.6" heavy barrel... I wish a lighter contour barrel will be available one day... I find a heavy rifle in .223 is unnecessary for most applications... That is one of the reason I did not like my SIG Classic Green!
The big allen screw that retains the barrel is too long and angular: it is unconfortable on the knuckles if the rifle is gripped on the mag well... I believe it sould be rounder and shorter or shrouded in some way. (that's a very minor complaint!)
I have a Vltor telestock on it right now but would really like the folder adapter as well... I like folding stocks for transport and telescoping stock to adjust length of pull and also allow smaller shooters (mostly girls as it turns out!) to use try out my rifles. I hope the folding adapter for AR stocks will be available at some point for us up here...
The ergonimics are real good. It handles like an AR and I have to remind myself that the charging handle is not at the rear! I like the bold hold open/release controle but I still have the reflex to tap the side of the rifle!
I find the fit is good... Not super tight but then it is a semi-auto rifle and some tolerance is good for reliable functioning... I have yet to shoot it so I can't comment on reliability, accuracy, etc...