40cal Gen 5 GLOCK 22 Gen5 The 40 S&W caliber closes the gap between the .45 Auto calibers and the 9×19 service calibers. The G22 is now available with Gen5 technologies including the nDLC finish, a flared mag-well, the enhanced GLOCK Marksman barrel (GMB) for increased accuracy, and an ambidextrous slide stop lever.