Started playing COD4 a week or 2 ago. currently a 2 star general. Way too easy :(
<3 M16A4 + Red dot sights.
Either that, or when im going stealth (in the map bloc), I use Silenced M16A4, Silenced Colt .45, UAV Jammer, Bandolier & I forgot the last perk.
the rest I just level the guns...