5.56mm
The M-16 Carbine or M4 use a 5.56x45 Nato round or the civilian version .223 Remington
The gas propelling the bullet is tapped, and operates the bolt mechanism.
The M4 CARBINE IS BETTER THAN THE M16.
Depends on which military. US uses the M16A1 rifle, or the M4 carbine version of the same.
The U.S. military primarily uses the M4 Carbine, which is manufactured by Colt's Manufacturing Company under the designation M4. The M4 is a gas-operated, air-cooled, magazine-fed carbine that is widely used by various branches of the military. Other manufacturers, such as FN Herstal and Remington, have also produced M4 variants under military contracts.
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 US Army presently uses the M4 carbine, a shorter and much modified version of the Armalite AR15.
The M4 carbine has a muzzle velocity of 2,970fps(884m/s).
um an m4 carbine is a gun last time i checked, and i don't think a gun would be able to shoot a bullet with a paper hammer. so i would say none.