Z-Frame compatability

[Danny72]

Alright, I know RT Frames need RT rails, and AM/MM stay exclusive too but how do I tell the difference?

I have an RTP Tac One, and want to put a Zframe on

[cougar20th]

The way to tell a classic RT frame from a normal am/I'm frame is the hole size where the thumbs screw goes. The hole on a classic RT is larger. That's the only difference.

. Agd used to make spacers to allow the large hole frames to work on am/I'm guns. Not sure if they still do.