FCW M4 Grip Adapter w/ 416 Style Grip Set (Marui / Tercel Type 89 AEG
 
M4 Grip Adaptor For Tokyo Marui / Tercel Type 89 AEG.
ABS Plastic Constructed.
When you custom it's kit at your Type 89 AEG, you can use back your original Type 89 Motor
As the neck of T89 a bit wider than original V2 Gear Box motor, we will wider the hole of those M4 motor pistol grip 
 
REMARK:
The T89 AEG, Masada stock in the photos are not included.