Prometheus Perfect Metal Chamber NEO (Complete Kit) H&K Airsoft Guns 1 mags will work in

1 mags will work in the 4

and the rail mount is nice and secure

This unique works great as a carrying case or a back carry style holster

Dimensions: 12mm deep x 20mm wide x 121

Sniper grade airsoft BBs for its very heavy weight

Prometheus Perfect Metal Chamber NEO (Complete Kit) H&K Airsoft Guns 1 mags will work inPrometheus 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