Valken Blackhawk Paintball Gun Corrosion-Resistant Aluminum and polymer Construction, Durable powder-coated receiver Stainless steel bottomline hose, Removable ported barrel, Replaceable barrel thread adapter MIL-STD-1913 Accessory Rail, Removable feedneck adapter, High-Flow aluminum Air source adapter, Modular design for easy customizing and upgrading Designed for use with CO2 or High Pressure Air, Meets or exceeds all applicable ASTM standards