In some units, it already has - several years ago, now. Special operations and light infantry units in particular have replaced their M16s with M4s (and this was done over a decade ago). However, some infantry units (most commonly, mechanised infantry units) have remained with the M16A4, rather than the M4. The Marines have also opted to retain the M16 (A4 and A5 variations), rather than phasing them out for the M4.
The basis of the M4 is the M16 rifle, for which Eugene Stoner is commonly credited. Development of the M4 was a cooperative effort between the Special Operations Community of the United States Armed Forces and Colt's Firearms.
Not really too much to tell. The M16 has a longer barrel, and the projectiles will leave the barrel with greater velocity for it. The M4 has the collapsible buttstock and 14.5 inch barrel, so it would be the easier of the two to utilise in urban terrain and such. The M16's longer gas system is the more reliable of the two, and the muzzle flash and noise of the M16 is reduced. The operating mechanism is the exact same, except that the M4 and M16 won't use the same return spring or buffer.
The M4 CARBINE IS BETTER THAN THE M16.
The M4 carbine was adopted into service with the United States armed forces in 1994.
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 standard assault rifle for the US Armed Forces is the M16, the Marines first created the M16A4 the newest version of the M16, before 2011 the US Army were using the M16A3 but now they are adapting the M16A4. Although the M4A1 carbine is being used more by the US military now then the M16. In about 10 years the M4 is to be replaced.
As of 2012, the M16 assault rifle has been in service with the United States armed forces for forty-nine (49) years. It was first adopted in 1963 as simply the M16. Since then new variants have been used, with the M16A2 and M16A4 being the most common today. It is slowly being phased out in favor of the M4 carbine, but still sees plenty of frontline service.