Don't forget, the numbers are supposed to be their patent order, which is why the Glock22 isn't a .22 and the Glock45 isn't .45 caliber. Their first gun was the Glock 17, so they had 16 patented items before that. So while it is likely that the Glock 44 and 47 are guns, it isn't a given. Let me caveat that by saying that they may be playing a little loose with their naming conventions. The long slide Glock 17 was the 17L, but the long slide Glock 22 was the Glock 24, not 22L. The 19x and 45 should be the same model with variations, but they aren't.