Shoot when I was in many of the M16s I went on duty with were A1 Lowers with A2 uppers (in the case of the A3) up until they switched the A2 upper for the A4 upper.
Although the M4 I had was nice, I always remember talking AR's with local cops that had nice eotechs and surefire mine was KISS but at least mine was FA.
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