Exactly what I expected
I was uncertain how well a Spartan male would work on a PS 90 because the mouth inserts into the rear opening where the bullets are ejected and that is a lot of weight cantilevered forward off of the mount…. Just bolted to the wall, and try to center the lower screw slot so you can adjust to keep the barrel Level on the wall and you’ll be good to go, mine is rocksolid, level, and does not move.
WE USE OURS TO DISPLAY OUR FULL AUTO P90 AT THE GUN SHOP AND GET COMPLIMENTS ALL THE TIME, LOVE THE PRODUCT!!