Depends on a lot of things really, like what map I'm using, how good the other players are, and what gameplay I'm playing...

For rifles I prefer the Carcano and the Kar98, so mostly I use the bolt-action ones.

For sniper rifles I usually use the Springfield bolt-action, but I don't like the semi-auto sniper rifles (they take to many hits to take down people).

For SMGs I use the Thompson or the MP-40; I hate the Moschetto.

And I don't really use Machine Guns.

enfield rifle

Springfield, 303 Lee Enfield, M1 Garand, and KAR 98 rifle / sniper.