i have a nice 2009 proto matix rail (pmr) for trade only. this gun shoots phenomonal. theres no leaks in the gun. however theres a little trouble screwing the tank in sometimes. it does screw in all the way. IT DOESNT EFFECT THE PERFORMANCE AT ALL. other than that its amazing. its probably had maybe 4 or 5 cases through it. PM ME OR POST BELOW. I DO HAVE PICTURES.