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.
No one will give you an M4 rifle/carbine for free.
M4 is the carbine- shorter barrel
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.