29-34 inches
The M4 is an assault rifle based off it's popular cousins the M16 and AR 15 also assault rifles.
The M4 carbine is chambered for the 5.56x45mm NATO cartridge. It will also accept .223 Remington rounds.
In the related links box below, I posted the information.
It depends on the weapon. Eugene Stoner the designer of the original AR-15 designed it as a full size assault rifle , but he never got to see the gun become famous. Colt later took up the design and made it for the military it was produced as a full size assault. later the designs were made to fit in a carbine platform which is known as the M4 carbine assaultlt rifle. The M4 is the main weapon in the U.S. military.
For now, the M16 is supplemented by the M4 carbine version, but there is no replacement named as yet.
The M16 assault rifle has a greater range than the M4 carbine as a result of its 20-inch barrel, compared with 14.5 for the M4. The M16 can hit an area target out to 800 meters while the M4 is effective to 600 meters.
MY Brand New Stag Arms M-4 Model #1 Cost me $850.00. I love it!
14.5 inches on the actual M4 rifle.
The M4 is capable of automatic fire, the AR 15 is not
The M4 carbine is a shorter and lighter variant of the M16A2 assault rifle. The M4 is a 5.56×45mm NATO, air-cooled, direct impingement gas-operated, magazine-fed carbine. It has a 14.5 in barrel and is 33 inches long.. It weighs 6.5 lbs.
No such weapon, so no. However, there there is a M16A4. It is possible, but, highly unlikely that an individual can buy one.
No one will give you an M4 rifle/carbine for free.