COWCOW B01 Blowback Housing Color:Black and mounts to most 20mm

and mounts to most 20mm picatinny and weaver rails

For use with green glow in the dark tracer airsoft BBs 6mm

Umarex 2279020

Designed to cover and protect extended inner barrels

COWCOW B01 Blowback Housing Color:Black and mounts to most 20mmB01 Blowback Housing is precision CNC machined from aluminum 7075 for ultimate durability and quality. Weighing in at just 18 grams, this blowback housing will improve the cycling action as well as gas tranmission. Also, the special design on piston head can let the O ring always in prefect condition. It minimises the air leakage during the blowback action and the different sizes of anti oil O Ring provided can fit common used nozzles in the market.