"Fits Ruger GP100"
Sort of.
I have a newish, 4.2" GP100. The retention mechanism would not close if the gun was wearing my Hogue made, Match Champion wood grips.
It would close, barely with the Letts style grips.
I returned it. I shoot the gun and can handle recoil much better with the Hogue grips.
I'm kinda bummed as this would have worked very nicely with a QLS fork on my Hill People Ute pack belt.