The first Glocks were made only about 20 years ago.
Don't take this as a flame; I just don't see the collectable value of Glocks.
Yes, some people go after the 17L and such, but Glocks have not changed that much.
I sell collectables, and most of the time they are something that is unusual, like a crank bait lure with hooks coming out the sides, instead of underneath. If Glock stopped making guns, or made a major change in them, there would be a more wide spread collecting interest.
You would probably get further starting a forum for pre-ban magazines.
That said, I'm in if the forum is for collectable weapons in general, not JUST Glocks.
I like things like War relics, military firearms, and old west stuff.