Metal Upgrade Kit
Suitable for Tokyo Marui M4 / M16 Series AEG Rifle
For M4A1 Extended Battery Buttstock
Package including Bolt set internal parts.
Lower Receiver Shell.
On both sides of the body engraved with instructions.
Beautiful engraved with "CAL MUTLI MOD LFT-15" Marking and "Skull bones" Pattern
Material : Alloy Metal
Weight(with box): 660g