The M16 is one of the rifles that is used by a lot games. In fact it is a pretty old weapon (see below), and more and more it is preplaced by the M4 carabine.

 

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Deutsche Artikel: Gewehr M16 A2 (23 Photos) und M-16 Sturmgewehr

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The M16 assault rifle was developed after the Korean war. In 1963 the M16 A1 was manufactured, but it had some serious difficulties:
1) it was not very reliable in a muddy environment
2) if a soldier used a fully filled magazin, bullets often got stuck
3) a lo soldiers called it a "toy rifle" because the butt stock was made with plastic

The different versions are:
M16 A1: 5.56mm, full auto fire
M16 A2: 7.62x51mm, stronger rifle, 3-round bursts only
M16 A3: used only by US Navy, 7.62mm, semi and full auto fire
M16 A4: mixture between M4 and M16A2, using standard mounts

Clones/copies and variants:

• AR-15 (Colt Models 601 & 602)
• XM16E1 and M16A1 (Colt Model 603)
• M16A2
• M16A3
• M16A4
• Colt Model 655 and 656 "Sniper" variants
• XM177
• Colt Model 733
• M231 Firing Port Weapon (FPW)
• Mk 4 Mod 0
• M4 carbine