Tokyo Marui Micro Pro Sight ForeArm Set Modification may need for installing

Modification may need for installing this kit on the other brand M4 GBB Series

Reference the APC sizing chart for correct fitting

-M4A1 Metal Body (Colt M4A1) (GP174)

The flash hider itself can be removed revealing a 14mm CCW thread

G&P Shotgun Receiver Rail for Tokyo Marui Shotgun (Long) is made out of Metal and is designed as a mount for the Tokyo Marui M870 Shotgun

Tokyo Marui Micro Pro Sight ForeArm Set Modification may need for installingTokyo Marui have released their own Micro Pro Sight which was made to fit the sight mount allowing the Red Dot to fit on the G series. It will also fit on any 20mm rail system so a vast array of products will allow it. The screws at the rear, on top and on the right side, will allow the user to adjust the dot horizontally and vertically.