Until December 2019 the only options for a rimfire “Glock” were either a conversion unit that mates a rimfire slide and barrel assembly to a stock Glock center-fire frame or one of the .22 ...

To reduce the mass of the slide, the whole top of the slide is polymer, with a smaller steel portion that includes the striker assembly and slide rail grooves. ... The Glock 44 averaged 2.69-inch ...