Re: M855A1 ammo- AP?
By standard rules in fourth edition it is likely just ball. thus (1) penetration and *1 damage with no modifiers on base damage.
In third edition you could have used the semi armor piercing modifier (1.25) penetration and *1 damage with no modifiers on base damage optional rule if you wished and still be RAW.
Of course as GM you are free to do and use any rules you feel like.
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