Check out this informative video to see how to field strip a Beretta 21A pistol. This tutorial will also show you how to remove a casing from the barrel of the Beretta 21A handgun if one gets stuck.
The gun is a semi-automatic chambered pistol for .22LR. It holds seven round in its magazine (eight will fit, but too tightly and cause jams) with an eighth round in the pop-up barrel/chamber. Yep, the barrel and chamber pops up at the front for loading, unloading, and cleaning. Field stripping consists of popping up the barrel and then lifting the slide off its frame. Easy as can be. It's double-action for the first shot and then single-action for subsequent rounds.