RP5 Airguns – The Umarex RP5 is a CO2 powered pump-action air gun with a piercing unit that can hold up to two 12g CO2 cylinders. The pellets are loaded into the barrel with a simple pump movement that resembles the pump-action like some shotguns. This will increase the firing rate and has a muzzle energy of up to 7.5 Joules. These outstanding airguns are now available for home delivery from Just Air Guns the UKs No1 airguns shop with low-cost home delivery. If you have any questions about our airguns then please contact the JBBG support team via this website.