The M4 Carbine is occasionally used in ProMod, but not generally in real competitive matches. Its primary disadvantage is of course its lack of damage compared to the AK47. Where the AK does 56-42 damage, the M4 does 42-28, meaning 3-4 shots are required to get the kill depending on range. It does, however, have the advantage of being the weapon with the lowest recoil in CoD4 Promod, and some players feel they are better able to put many bullets into a target at long range than with the AK. Also, the M4's iron sights are not as good as the AK's.