Poor machining - Griffin Armament Cantilever SPRM

Very poorly machined and a PITA to level an optic in it due to the out of round rings and the lower mounting screws that come up through the bottom of the rings. You have to take the mount on and off your rifle, or mounting platform several times to get them level because of the stupid bottom ring screws. Took me 45 minutes to an hour to mount each one of these. Griffin claims these mounts are so precise that they will never leave ring marks on your scope but I can tell you through my 2 samples that they are rough finished and they will scuff up the tube pretty bad right down to the metal in some spots. I only torqued my rings to 18" lbs. When I took off the mount I could literally see where the rings were contacting the tube and where they weren't. I have had all kinds of mounts and these are the worst I have ever used. They are just a poor attempt to copy the SPUHR mount. Never again!!