AEK - Do i NEED a reason? Low recoil, accurate, and really f**king powerful!
MP7 - Fast reload, accurate, and nice. :P
None, they all suck.
No accuracy what-so-ever, horrible hit-boxes, all the bad stuff
But if i HAD to pick - Dragunov, because it shoots fast. :P
I like the MG43, but im not sure. :P
USAS-12! Fully automatiiiiic
M1911 - I have no need to give a reason why it rules.