Retro Arms CZ Billet CNC 8mm Ver. 2 Gearbox Shell Grenade If you need a midcap

If you need a midcap mag for your ARP gun

5mm inner diameter x 10

steel bearing spring guide

320+ FPS with

Retro Arms CZ Billet CNC 8mm Ver. 2 Gearbox Shell Grenade If you need a midcapUnlike 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