Attaches solidly but no adjustability for different receiver pressings - UTG Pro Extended Picatinny Claw Mount for MP5 / MP5K

I installed this rail on a MAC5. The rail did not fit with the rail in alignment; it was visibly canted to the left. I don't blame it on the rail, instead suspecting the MAC5 receiver pressing to be slightly out of spec. However, unlike other claw mounts whose feet can be adjusted by means of mounting screw tension which allows for the rail to be leveled, this rail cannot be thus adjusted. Will probably remove it and replace it with a rail that can be adjusted. 4 stars for being a solid, out-of-the-box mounting system, minus one star for the lack of adjustability.