The only thing I felt needed changing on my RIA Tactical (not railed)
1) The front sight doesn't work for me
2) The plastic mainspring housing is a cheesegrater. I piece of tape fixed that
3) The stock grips suck and I'm not even particular. I don't mean they look ugly, I mean they are weird to hold.. BUT I think they are cheap on purpose because RIA knows everyone just tosses the grips for their own preference, so why provide nice ones?
4) I added a $30 Wilson clip on mag well because I used the gun for USPSA once.