Prometheus Perfect Metal Chamber NEO (Complete Kit)

Prometheus Perfect Metal Chamber NEO (M4 Hopup Chamber, with Pressure Arm and Gear).  This is a replacement hop up chamber for all M4 type AEG airsoft guns.  It's a very high quality metal made chamber with all the parts to make it work better than your original.  Made in Japan for highly upgraded guns, custom guns, etc.  We recommend the Prometheus Purple bucking for use with this.

M4 Hopup Chamber, with Pressure Arm and Gear