M-855 ball 62gr. (with the green tip) standard issue. M-193 ball 55gr. still issued to some National Guard and Reserve units (and some Air Force units). Mk 262 mod 1 OTM (open tip match, 75 or 77 gr. Hornady or Sierra can not remember which) limited issue to some units.
The ammo oracle in the ammunition forum at AR-15.com has much greater detail.
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