The Beeman air pistol works with pre-compressed air. The pressure is built up when the pistol is closed. There is no spring wear and tear on this air pistol and no pump or CO2 cartridge is required for its operation. The consistency of Beeman P17 is excellent. You can take a closer look at it in my chrony test.
You can aim with the rear sight and front sight. The high contrast of the fiberglass sight helps extremely, even in poor light conditions. Alternatively, a reflex sight or pistol scope can be mounted on the 11 mm dovetail. If you only have an optic with a picatinny rail, you can use a 11 mm dovetail to picatinny adaptor.