If what I have read about Glock the 17 getting its name because it was Glocks 17th patent and other models following the same naming criteria, then the release date would not necessarily play a roll. Also, Glocks 44th patent may not have even been for a new firearm. if that is the case then a G44 …
https://www.glocktalk.com/threads/where-is-the-model-44.1724052/

