The gen 4 RTF2 is a little scratchy (no holes in me or my clothes including base layer after 4mo EDC) , the part i feel is the mag release. I think i might just file the edges a bit. Other than that i love my 19 and I would like to start some competition shooting with it, along with advance pistol classes. Since i bought it for and all around gun whereas my M&P45c gets a little expensive pouring 1000 rounds through it!
Dont forget the gen 4 has adjustable backstraps and you can switch the mag release if your lefty.