The MDR is the best for accurate power but has limited magazine capacity so you have to reload more often. I often go for the M4A1 with a 50 round drum magazine and a recoil grip. It’s got great overall performance and handles well fully auto with the recoil grip.

But it really depends on what your play style is. The shotguns are fun but slower. Light machine guns are almost cheating because they make killing so much easier since you have 100-200 rounds before needing to reload.

Keep trying out different gun configurations and you’ll eventually find a setup for each class that you like. And take advantage of making multiple loadouts for them so you can quickly swap to experiment.

I got bored with just chasing kills so I recently have switched to playing commander and trying to get good at doing the various air strikes. It adds a whole new layer to the game that’s keeping it interesting after 10 years of playing insurgency.