Used Glock 22 Gen 3 trade-in. .40 S&W.By far the most popular police service pistol in the United States, the GLOCK 22 fires the potent 40 S&W cartridge. SAFE ACTION System.Quoted GLOCK 22 family: caliber .40 S&W, barrel 4.49 inch, overall length 8.03 inch. Massachusetts listing uses 10-round magazines. Used Gen 3 trade-in. This is not a Gen 2 and not a current-generation G22.Battle Road Firearms, 561 Main St, Hudson MA. CallREDACTED. MA residents, all state and federal laws apply.