I don't remember where I got it. I did a quick search, but didn't have it jump out at me. May try some more, but you'll probably find it as easily as me.
I have the GLOCK 19 mag model. Have had it for quite some time. Had one before, sold it, regretted it. Now I'm having the barrel threaded by a gent who threaded a couple other suppressor hosts I have. I am anxious to screw on the can. As far as the rifle itself, I really like it - very reliable. I have a few GLOCK 9mm's so it makes sense to me.
I could own another one of these for the right price. So much fun. Adding a sling this weekend. No other mods needed. Cheap 33 round mags work without any problem from CTD.