TexasCHLforum.com

There is a big difference between Gen4 and RTF Glocks, particularly in slide and recoil spring design. Easiest way to tell is to look at the model number on the slide -- it will be followed with the word "Gen4". Gen4's also have interchangeable backstraps.

Get what feels best to you though -- Gen3, RTF, Gen4, doesn't matter, they're still Glocks and have same quality to them.