Neighbors daughter has one, I took the sight off and imprinted the mounts side with a checkering file which helped with looseness. She ended up putting a cheap mount on the rear and a TR 25 knock off red dot on it that I got on Amazon for $22 bucks and she loves it. The sight has a similar mount as a old redfield that I have but the thread pattern is larger which would require tapping the receiver side for a 8 screw size I believe.
Sight sucks to be honest, buy a scope mount and stick the knockoff red dot on it for $30 total is my suggestion after messing with it for a hour.