Couple reasons, one being doctrinal differences between units. Another reason being is that some of the M16 rifles are special purpose weapons, intended for unit sharpshooters and the like.
The M4 CARBINE IS BETTER THAN THE M16.
The 3rd Infantry Division at Fort Benning primarily uses the M4 carbine as its standard issue weapon for soldiers. The M16 rifle may still be present in some capacities, but the M4 has largely replaced it in most operational settings. The M4's versatility and features make it more suitable for modern combat scenarios.
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.
M4 is the carbine- shorter barrel
An M4 is a short barreled version of the M16, so yes, they can look quite similar.
The M16. The M16 entered production in 1960. The M4 entered production in 1984, and was an improvement over the earlier XM-177 carbines.
Yes, along with the carbine version of the M16, the M4.
Not entirely. The Marines retained the M16, and most Army mech units opted for the M16A4 rather than the M4.
The M16 and the M4 are the US designations for the AR-15 pattern of rifles.
If you mean the US Army, the M16 and the M4 variant of the M16.
Most airsoft battles take place in close quarters which is what the m4 was made for. Unlike the m16 which was made for longer ranges
The M4 is a smaller version of the M16. It has less range, but it is better for urban combat.