Most common glock?

[ian_in_vic]

There's at least one in use here in Victoria, believe it or not the guy doesn't reload - he just leaves the brass on the range. I did hear a rumour that one of the local PD's use it for ERT, so that may be the answer.

 

[tjhaile]

I would guess that the rarest full-size, generally available Glock would be the 37 in .45 GAP followed by the 31 in .357 SIG.

 

[skoalbandit]

I don't see the 45 GAP sticking around long. It was the answer to a question no one ever asked IMHO.