Features:
● Colt XM16E1 Model (Mod) 603 "Early Type" U.S. ARMY model style.
● 20" outer barrel (thing barrel).
● Front sight base with steel sight port.
● Front sling swivel covered with rubber.
● Black A1 nylon handguard, with heat protectors.
● Fixed carry handle without deflector.
● A1 steel rear sight set.
● A1 steel dust cover.
● Tear-drop forward assist buttom.
● A1 lower, A1 pistol grip.
 
Infornmation:
Model: XM16E1 
Materials: Steel, Zine Alloy, Alloy, Nylon, Rubber
Length: 987mm
Weight: 2530g (5.6 pounds)
Power Source: Green Gas
Action: Semi-automatic with blowback, single action only
Ammo Type: 6mm airsoft BBs
Ammo Capacity: 20-round full-size metal 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 
PS:
20 rds Gas Magazine for VFC M4/M16