Yes. There are many versions of the M4 Carbine available for civilian purchase. But you have to have a permit for it to be full automatic. Semi automatic AR-15 style rifles are very popular. Note- the full auto M-4 Carbine was created after May 1986. In the US, only those full auto firearms already registered to private citizens on that date could be transferred to a private citizen in the future. So while a semi-auto AR-15 style carbine is legal in most states, the full auto version cannot be transferred to a private citizen- too new.
The M-16 Carbine or M4 use a 5.56x45 Nato round or the civilian version .223 Remington
You wil have to specify if you are looking for military, police or civilian.
No unless you're a Radical Muslim !
The M4 carbine is chambered for the 5.56x45mm NATOcartridge. It can also fire the civilian .223 Remingtonround.
The M4 CARBINE IS BETTER THAN THE M16.
M4 is the carbine- shorter barrel
No one will give you an M4 rifle/carbine for free.
The Colt M4 Carbine .22 is a replica of the real M4 but in .22 caliber.
There is an M4 carbine in Call of Duty: Modern Warfare 2.
The M4 carbine has a muzzle velocity of 2,970fps(884m/s).
5.56mm
While the M4 Carbine is intended to fire a 5.56x45mm NATO round that is distinct from the .223 Remington, both are centerfire cartridges. So yes, the M4 Carbine is a centerfire rifle.