Gen5 changed the Glock in several ways, and the G21 Gen5 brings those updates to the .45 ACP. This used pistol comes in its case with two magazines.

The Gen5 frame has no finger grooves and a flared magwell, and it uses an updated barrel with improved rifling. The G21 normally holds 13 rounds in a wide, double-stack grip. Buy ammunition in the quantity you will shoot in one session, and store the rest somewhere cool and dry.

The width is the main thing to consider. Some hands handle a G21 with no trouble and others do not. The Gen5 backstrap sizes help, but it is worth holding one before you buy if you can. The .45 ACP round pushes more than it snaps, and many shooters find it comfortable once they get used to the grip.

Parts and holsters for the G21 are easy to find, and the design has a long record in the field. Look over the photos for the condition. It is sold used and as described. It ships to your FFL dealer, and the background check is completed there.