Retro Arms CNC HPA V2 Gearbox PK126 VFC have been producing HK416

VFC have been producing HK416 and M4 GBBR series for a long time

"Semi/Auto ramping" fires in semi and switches to full auto if the trigger is rapidly tapped

The KWA 2016 model ATP-SE

Fits in the magwell

Retro Arms CNC HPA V2 Gearbox PK126 VFC have been producing HK416This shell is machined just for HPA parts. The price is lower due to the reduced machining time (no need to accommodate AEG parts) and because no spring guide is included. These Gearbox Shells are fully CNC machined from a block of 7075 T6 Aluminum. This material is very strong and can endure a ton of stress. Anodized black for corrosion resistance. Comes with screws.