Firearm Rack’s guess of what we think the Glock 44 is. Back in 2012, Gaston Glock filed a patent for a slide that uses polymer inserts to cycle “low-impulse ammunition” in their blowback Simunitions FX Glock 17T and Glock 19T training pistols. Glock’s goal was to replicate the feel of a duty caliber firearm while avoiding an aluminum slide as you find on most replica .22lr pistols.