I defintitly like the MP-40 a lot because, well it's just amazing. If you don't like it I would use the Thompson with the round drum & double tap when you get those gun add-ons. I would also try the Type-100 with double tap as well.
MP-40 is a scrub gun. Anyone who runs up on me with Jugg/Mp-40 will get drop-shotted.
I don't drop-shot unless it's a last resort, or I'm not thinking about it. Usually all you need is Steady Aim/MP-40 to kill someone, so an easy way to dodge the bullets is to drop-shot. I'm killer at drop shotting. I make kids with MP-40 Master or something in their Clan tag or as their gamertag look like idiots.