Gamo P-23 CO2 airgun.
The P-23 is styled after the Sig Sauer P230 but is not licensed. This version pictured has the combat grip. The standard grip has no finger mouldings.
The P-23 features a rifled barrel so is better suited to lead BBs rather than steel. The integrated magazine has a capacity of 12 BBs and is built into the frame, sitting underneath the barrel.
It’s possible to pellets in single shot mode by loading them directly into the breech. However, the BB magazine needs to be emptied before doing this.