Retro Arms CZ Billet CNC 8mm Ver. 2 Gearbox Shell Grenade 320+ FPS with

320+ FPS with

Magazine flap is adjustable for height

steel bearing spring guide

If you need a midcap mag for your ARP gun

Ambidextrous Mag Release

Retro Arms CZ Billet CNC 8mm Ver. 2 Gearbox Shell Grenade 320+ FPS withUnlike most other gearbox shells on the market, the Retro Arms CZ gearbox shells are machined out of a solid block of billet EN AW 7075 T651 aluminum, the same aluminum they use for Boeing commercial aircrafts. Combined with reinforcement of key stress points, the gearbox shell has undergone extensive stress tests and have proven to be resilient without any signs of wear. Quick Change Spring System Anodized Finish Reinforcement in Key Stress Points