Galil's have always been my favorite weapon for long range spray-and-pray headshots.
(P90's are good for medium range, while deagles are for close)
Might just've been a good shot lol
But there
have been some changes to the aiming, and the distance-of-fuzzyness has been incresed, so they aim better at farther distances.
As for WinCVS, I've never used it, but TortiseCVS works awesome.