I do not think that the Glock 17L's are in the catalogue anymore. It looks like the two with the DB were made in April of 1988.
Mine has a serial #BMDXXXUS and was made in July of 1995 long after the DB series. Mine also has the ported barrel.
It is a neat pistol and I have not seen another in the Cincinnati Ohio area.
I have no idea how many were imported into the U.S. but would lover to know.
I never thought of the barrel cracking. Guess I should look for an after market fully supported barrel for it.
Luckily we have a gun show in Cincinnati this weekend, I will try to find one there.
Thanks for the posting.