Actually, Fall Camo is 250. At least I got it at 250 for the M4. Doesn't matter, 'cause I've switched to the ACR. Actually, I'm currently playing as a sniper.
It happened again. The 'green' name above an enemy that turns red when you aim at them. This time, I didn't shoot. I followed him after his name turned red. He went around a corner, and when I turned to go after him, the red was gone and no green name above him. I think it's just a game glitch and not a hack. My game has all sorts of glitches. I got so tired of the Stinger glitch (noting gets shot down after a clear lock on) I've switched to a shotgun secondary.
Also, can't believe the .50BMG is not a 'one shot kill' sniper rifle. In anything, that's the gun to be it. Is there a way, besides aiming for the head, to make it a one shot kill rifle? FMJ?