I have a friend with a RMR mounted on a M&P pistol. He has just sent it back to Trijicon for the third time. The adjustment screws keep working loose under recoil and are self rotating which moves his zero as he shoots. Not sure at what round count this started, but per his most recent communication with Trijicon they are coming out with an updated version of the sight that is more durable in the very neat future. I would think about waiting to see what comes out at SHOT!