If you have the money, time and a good gunsmith, yes.
no
M4 is the carbine- shorter barrel
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 M16 assault rifle has an overall length of 39.5 inches (1,000mm) and a barrel length of 20 inches (508mm).
yes
Same as most US Rifles; barrel, receiver group.
Yes. Principle differences between the M16 and M4 include: M16 has a 20 inch barrel while the M4 has 14.5 inch barrel, M16 has a fixed buttstock while the M4 has a retractable six-position buttstock. Virtually all M4s have a 20 millimeter accessory rail, while only M16s after the A3 variant have the rail. The M4 carbine also has a stepdown in the barrel to accommodate the M203 grenade launcher due to its thicker barrel profile. Performance-wise, the M4 is also less accurate at range due to its shorter barrel, but is easier to maneuver in cramped environments.
The effective range of an M16 assault rifle with 20-inch barrel is 550 meters for a point target, and 800 meters for an area target.
Any apex barrel with a 98 thread will fit the alpha black.
if your talking about the forward assist it is to ensure the round is locked into the barrel
The M16 assault rifle has a 7075 aluminium alloy receiver, steel barrel, bolt, and bolt carrier, and glass-reinforced polymer handguard, pistol grip, and buttstock.
No the British SAS use the C7 Series of Rifles, similar to the M16 they are infact more reliable and have a longer barrel life. The weapon was developed from the M16A1E1