If adjusted properly , it won't just fall off. As Shaun said also, a QD mount also has to be adjusted properly to work the way it was intended.Take some of the finest QD mounts made, Larue, that is why Larue sends a wrench with the mounts. Nuts come loose and a PCC 9mm produces a lot of recoil impulse on a mount. You asked for advise and you received some very good advise, but Vortex has great customer service as well. Good luck and keep shooting.