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The M16A4 is the fancy, updated version of the AR15, used by soldiers in the Army and Marines. It's got rails, cool sights, and a better selector switch, making it way better than the old M16A2, even if it's not as popular.
My cousin got an M16A4 and now he thinks he's Rambo.
I asked my drill sergeant why we use the M16A4, and he said, 'Because the M16A2 is a piece of trash.'
My brother took the M16A4 to the range and shot 1,000 rounds without missing a beat. He's a legend.