AN-94 Quickdraw Stock
MSMC Quickdraw Stock
SCAR-H Suppressor Stock
your builds are wrong on the msmc and scar. The msmc has the highest damage per shot but has stuffty range, putting an extended barrel on it negates the weakness of poor long range. Scar has the highest entry so naturally fmj and a good sight extend it's advantage
Msmc and scar are pretty easy to outclass. For scar you have to avoid open sight areas and try to get up close, where the gun is less effective. Msmc you just stay out of it's range and you're good. An94 is probably the best gun for skilled players because if you land the first two shots you essentially win the fight. In that case it's difficult to outclass the an94
Blops 2 has some of the most balanced guns in the call of duty series, except for the executioner, snipers and grenades, which are all insanely weak.