The United States Armed Forces extensively uses the M4 carbine, which is largely replacing the M16 rifle as the primary infantry weapon in the United States Army and United States Marine Corps combat units.

Features:
Polymer body
Adjustable hop-up system
Polymer upper receiver with 20mm top rail
Polymer lower receiver
Polymer handguard
Polymer outer barrel
Polymer Front and Rear Sight
Polymer 6-position stock tube 
Polymer stock
Polymer ergonomic pistol grip
Polymer charging handle, dust cover, selector, forward assist, bolt release, trigger, trigger guard, magazine release

Specifications:
Length: 750mm / 830mm (total length)
Weight: 1858 g (with magazine)
Color:  Black
Material: Plastic, Alloy
Hop-up: Adjustable
Shooting Mode: Safety, Semi-Auto, Full-Auto
Magazine Capacity: 300 Rounds
Bullet Type: 6mm BB
Battery: 9.6V Battery (mini type plug)
Power(Muzzle Velocity): 300-350 FPS (0.2g BB)

Package includes:
Cyma M4 CQB RIS - CM501
300 Rounds magazine