The VFC MK18 MOD 1 GBBR upper receiver set is a complete URG (upper receiver group) for you to directly mount on your VFC M4 GBBR.

This is a long awaited accessory for VFC GBB users as this can allow you to simply purchase a standalone URG to swap out with an already existing lower receiver.

Compatibility: VFC M4 GBBR Series
Includes: x1 VFC MK18 MOD1 GBBR Upper Receiver Set - Tan