I just can't help but notice over the past year or two that the potential for a rare and desireable glock seems to be a certainty over the next few decades. There have always been relatively scarce models. True 1st gen G19, two pin G22, and 2nd gen G32 models. Lately though there has been a ton of new potentially rare glocks. G21SF Ambi Pic rail G21SF Ambi G21SF G21SF RTF2 (Did these ever have fish gill slides?) G17, 22, 19, and 23 RTF2 with fish gill slide (already discontinued) G17, 22, 19, and 23 RTF2 without fish gill slide Technically these are all 3rd Gen guns. Will the 4th gen make them all be discontinued? Will we eventually see the RTF texture on a 4th Gen? When the 4th Gen G21 arrives with the reversable mag release will the Ambi G21 be dead? Anyone else pondering these things?