Question: what type of ammo does a glock 19 gen 4 use

title: Glock
text: The Glock 19 is effectively a reduced - size Glock 17 , called the `` Compact '' by the manufacturer . It was first produced in 1988 , primarily for military and law enforcement . The Glock 19 's barrel and pistol grip are shorter by about 12 mm ( 0.5 in ) compared to the Glock 17 and uses a magazine with a standard capacity of 15 rounds . The pistol is compatible with factory magazines from the Glock 17 and Glock 18 , giving the Glock 19 available capacities of : 17 rounds ( standard magazine with + 2 extension ) , 10 , 17 , and 19 ( standard Glock 17 magazine with + 2 ) , and the 31 ( standard Glock 18 magazine with + 2 removed ) and 33 rounds of the Glock 18 . To preserve the operational reliability of the short recoil system , the mass of the slide remains the same as in the Glock 17 from which it is derived . With the exception of the slide , frame , barrel , locking block , recoil spring , guide rod , and slide lock spring , all of the other components are interchangeable between the models 17 and 19 iwb holster . The