Thanks, Dan, but ht e 1981 is just the standard extended magazine release; the one that we were discussing some time back is the almost unobtainable "mid-length" extended magazine release, made specifically for the FBI (and possibly other alphabet agencies/organizations). I realize, of course, that I could just go with a 1981 and file it down a bit...but that would be too simple!
I have not placed an order with Glock since I attened the Advance Armorer's course in July. I will be placing an order soon and I will add the 1981 to my order as I normally keep these in stock (the old full size mag release) along with the new full size mag release.
I'll let you know what I get.