Depends on which military is using it. In the US Military, the standard issue cartridge is the 5.56x45mm M855 cartridge. It is a 62 grain full metal jacket round. In NATO, the SS109 cartridge is standard, and this is also used by many non-NATO forces which maintain some degree of alignment with the West.
M855 62 grain ball.
5.56 nato or civilain 223 remington
The M4 carbine is chambered for the 5.56x45mm NATO cartridge. It will also accept .223 Remington rounds.
blank, ball and tracer at the very least.
The M16 Assault Rifle or the M4 carbine is the typical primary weapon The M9 pistol is the standard sidearm hey dont forget about the standard issue knife
its the m16 family including m4a1 carbine aka m4 carbine
The Colt M4 Advanced Piston Carbine M4 is highly rated for three reasons; the fail rate is low, in field and range testing it encountered onle one jam per 200 rounds and is completely portable due to the removable handle.
Perhaps they just forgot to add the "A1" to the nomenclature in CoD4. But yes, you are correct - the standard M4 carbine has the three round burst feature, while the M4A1 and the Canadian variant of the M4 (the C8) have full auto capability.
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.