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RossA wrote:I don't own any Glocks, so I don't know the difference between the 17 and the 19. Why would one model of Sub 2K accept some mags but not others? I have a Glock mag Sub 2K, and some Glock mags for it, but I don't know whether they are 17 or 19. If I ever get more mags, it might be helpful to know which is which.

So you have a sub 2k? You don't know if it is a 19 or a 17? See my response above at least for gen 2 versions. I can't speak about all hand sizes but I have a medium-small hand and the 17 version fits perfectly. I think the 19 for me would be short. I use Glock 17 and Glock 18 (33 rounders) in mine. All will fit in my Glock 26.

RossA wrote:So is there a stamp or something on the gun saying which model it is, or do you just have to try out different mags to see what fits?

Just above the mag release button on the left mine says G17/22 Mag and mine is a G17. I would assume the Glock 19 mods say G19/?.
The only consistent source of these rifles seems to be gunbroker (where I got mine). I haven't seen at Academy. I do like mine and have had no problems. If you do a search on gunbroker you need to use different variables such as SUB-2K9, sub2000, etc.