[A Simple Soldier]

Current M16A2s, M4s and other 5.56mm weapons use a 62-grain bullet, informally known as the SS-109. Been that way for many years if not almost 2 decades. I forget the official nomenclature or DODAC number.

The 55-grain round was used in the M16/M16A1. It can be used in the A2 or higher, but the DODAC number is rare in the inventory.

[xzins]

I thought I'd read somewhere before the war that they'd argued about reducing grains to slow the round. Some thought it such a fast, small round that it wasn't doing any knockdown at all....just passing on through. I think my memory's correct on that, but I have no idea where I read it.

[SirFishalot]

I believe you are correct. Old green tip is the standard ammo now.