Our 4.5mm / .177 AK-15 Co2 BB rifles are based on Chinese-made CYBERGUN AK-47 (Type-56) rifle's receiver. This receiver is a real Type56 (AKM) stamped receiver (but not temperature-treated) with solid steel barrel (NO "sleeve" barrel inside) and all-steel parts kit (£480) installed in our workshop, which requires 6-8 hours of labour (£300) including the use of lathe. This rifle can be fitted with a real AK magazine filled with 7.62mm inert rounds and AK bayonet for display and training purposes (all joints fixed by steel pins and grub screws just like on a real firearm). Essentially we build a "deactivated" AK-15 with all moving parts, which is a BB air rifle at the same time. They are cheaper then old spec deacts (!) and suitable for firearms training. A power upgrade comes as standard (power is increased by about 15% - 20% - the main air valve was re-machined to allow more air preasure into the barrel) and all rifles are perfectly zeroed on our indoor range.