As an expert in firearms, I can tell you that the "M" in the designation of military firearms often stands for "Model." The M16 is a well-known American family of military rifles. The M16 was first introduced in 1964 and has undergone several revisions over the years, with the most common variants being the M16A1, M16A2, and M16A4.
The M16 was designed by the American engineer Eugene Stoner, and it was one of the first rifles to utilize a high-capacity magazine and fire a high-velocity, small-caliber bullet. The M16 and its variants have been used extensively by the United States military and various other armed forces around the world.
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