regular frame with no finger grooves and half moon at magazine opening???...may be a Gen 2
finger grooves alone???...may be a Gen 2.5
finger grooves and light rail???...may be a Gen 3
finger grooves, light rail, "fish gill" slide grasping grooves and sharp dot pattern frame?...may be a Gen 3 Rough Textured Frame
finger grooves, light rail, less sharp dot pattern frame and Gen4 on the slide???...Gen4
that'll get you started...more will chime in...
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Last edited by silversport; 02-19-2013 at 04:19..