The rail attachment part is a hard plastic, it didn't quite slide on to the rails so I had to gently tap it with a hammer to slide it on. The handle is a bit tough to change from down to folded - the button you depress is a little sticky to engage. Wouldn't suggest this grip for a real gun. Feels easy to break.
Pros: It folds up, contoured grip, rubbery feel-soft.
Cons: Wobbles a bit, hard to install-had to use hammer to get it on the rails.
This review was written in the old system and had content requirements that are different than reviews written today.