Z-Parts MK16 DD GOV Aluminum Outer Barrel for Marui M4 MWS GBB Rifle (16 inch) Tokyo Marui MTR16 G-Edition GBBR (ZET System) - Cerakote Version Bottom screw tighten the grip

Bottom screw tighten the grip onto rail

Airsoft Masterpiece CNC Steel Hammer & Sear Set (STI DVC/ 2 Tone)

Suitable For Tokyo Marui FN 5-7 Series Airsoft Gas Blow Back GBB Pistol

For M4A1/ SR16/ SG551+ Airsoft Electric Gun (AEG) Rifle

Z-Parts MK16 DD GOV Aluminum Outer Barrel for Marui M4 MWS GBB Rifle (16 inch) Tokyo Marui MTR16 G-Edition GBBR (ZET System) - Cerakote Version Bottom screw tighten the gripZ Parts MK16 DD GOV Aluminum Outer Barrel for Marui M4 MWS GBB Rifle (16 inch) Aluminum Construction Suitable For Tokyo Marui M4 MWS Series Airsoft Gas Blow Back GBB Rifle Essential for building the URGI complete gun if doing it from scratch