So I feel that with a couple small adjustments to the Geissler frame on can use all sorts of aftermarket rail systems. And if one modified the Geiszler rails, they could drill the trigger housing pin hole, a little lower and everything would be level. From what I can chill rook tactical, and 80% arms split rail systems will fit as long as you’re willing to make slight adjustments to the frame. I am hoping to have a discussion with as many people as possible about this because I want to know if anyone’s got a better way.