You do know that Trijicon offers a dovetail mount for rear pistol sights right? About $80 on Amazon. I hope he likes the sight (And I'm sure he will) because that slide is permanently altered now.
http://amzn.com/B004HCCMLW
Now why would you go and bugger up a beautiful RMR like that by sticking a Glock on it!?
Maximinus I like the way you think!!!!!
Ya thats definitely doable. This was a favor for a friend and he didnt wanna go thru the hassle of changing sights so i just cut the existing sight back a little to clear the rmr. I think i would prefer it with the rear sight in front of the optic as well.