Features:
High Quality Full Metal Receiver, Barrel Assembly, and stock tube
Semi /Fully automatic Firing models.
Skull-Frog Navy Seal Laser Engraving
One-piece metal Hop Up
Six Position LE type retractable stock
WE M4A1 AEG Airsoft Rifle is very reliable AEG
Infornmation:
Model: M4A1
Materials: Steel, Zine Alloy, Nylon, Rubber
Length: 768/850mm
Weight:4000g ( 8.8 pounds)
Power Source: AEG
Action: Semi/Auto
Ammo Type: 6mm airsoft BBs
Ammo Capacity: 300 round magazine
FPS: 400
Bunker Tech Upgrades
Maple leaf gbb 6.02mm Inner Barrel
Maple leaf  High Accuracy Hop-up Bucking- Internal Parts Adjust
All function checks, to avoid common tolerance issues.
BB weight for optimal performance: 0.36 gram 
50 Rds Gas Mag for WE PCC GBB Series