 It is popular with both casual target shooters and airgun enthusiasts; it is excellent out of the box plus offers customization options and upgrades.Such modifications include aftermarket/third-party and user-community alterations and upgrades such as "mod boards" that can increase the rate of fire up to 2000 rounds per minute and provide true fully automatic operation, adapters to use external propellant sources (such as 20 oz paintball CO2 tanks or HPA scuba tanks), dye kits to change the color (commonly RIT fabric dye is used), and longer barrels (higher velocity).The quality of the gun is high, with the main functional components being made from firearms quality steel and the plastic parts (trigger, main receiver housings, buttstock, lower magazine cover) being made from firearms quality fiber reinforced polymers.