The GLOCK® 45 Gen5 9mm Semi-Auto Pistol is the semi-compact crossover many have desired for years. The G45 is a hybrid between a Glock 19 and a Glock 17. You'll get the shorter slide assembly (4.02" Barrel) from the 19 paired with the longer grip of the 17. For some hands, the Glock 19 grip is a little too short. That's where the 45 steps in. The G45 comes with the same popular upgrades of all Generation 5 GLOCK pistols like the Glock Marksman. 2- 17+1 mags.