This is just a model.
The M4 Carbine is a shorter and lighter variant of the M16A2 assault rifle. The M4 is a 5.56×45mm NATO, air-cooled, gas-operated,[a] direct impingement,[citation needed] magazine-fed carbine. It has a 14.5 in (370 mm) barrel and a telescoping stock.

The M4 is extensively used by the United States Armed Forces and is largely replacing the M16 rifle in United States Army and United States Marine Corps combat units as the primary infantry weapon[9][10] and service rifle.

The carbine is also capable of mounting the M203 and M320 grenade launchers. The distinctive step in its barrel is for mounting the M203 with the standard hardware. The M4 has semi-automatic and three-round burst firing modes (like the M16A2 and M16A4), while the M4A1 has semi-automatic and fully automatic firing modes (like m16A4 and m16a3)

|Production history|
|Designed: 1983–1993|
|Manufacturer: See Manufacturers below|
|Unit cost: $700 (avg. cost)|
|Produced: 1991–present|
|Variants M4A1|
||Specifications||
Mass: 6.63 lb (3.01 kg) empty
7.75 lb (3.52 kg) with 30 rounds
Length: 33 in (838 mm) (stock extended)
29.75 in (756 mm) (stock retracted)
Barrel length: 14.5 in (368 mm)
Cartridge: 5.56×45mm NATO
Caliber: 5.56 mm (.223 in)
Action: Gas-operated, rotating bolt, Stoner expanding gas
Rate of fire: 700–950 round/min
Muzzle velocity: 2,970 ft/s (910 m/s)
Effective firing range: 500 m (550 yd)
Feed system: 30-round box magazine or other STANAG magazines. Magazines with different capacities also available
Sights: Iron sights or various optics
A 10th Special Forces Group soldier with an M4 carbine during an exercise in July 1995
A U.S. Army 82nd Airborne soldier holds an M4 carbine in Vitina, Kosovo in January 2000 during the NATO-led KFOR mission, the first operational use of the M4 by U.S. troops.
Some m4a1 CSGO