I've heard good things about the "new" mk 318 Mod 0 for 5.56.
I've heard it is a better all-around round for minor barriers like glass and car doors, etc. It's a 62 grain hollow point boat tail round that performs better (I heard) on the target than green tip. At least one guy passed on that it's more accurate than green tip and he thinks it's more effective overall than Hornady TAP.
Anyone here with good info or experience on it?