[lurkingknight]

I've used 1 and 2 and 3 point... 3 with my m14 and a 3 with my mp5

I generally use a 1/2 combo though in the shape of an ms2.

A 3 is pretty similar to a 1/2 but it distributes weight a bit better, but gets tangled up easily if you don't practice with it. Basically if you want to switch right handed to left handed shooting.

1 point for normal carry and shooting, it's nice to let it hang when standing around instead of in your arms. You can have one hand on the pistol grip or foregrip instead of both hands, or no hands.

2 point for long walking so it's not bumping in my legs. Also it looks like 0 threat so I do that when I walk to respawn. Having a rifle slung on your back so you're not holding it for the entirety of a long game make a huge difference for overall fatigue.

This is aside from being able to forget everything and drop the rifle if you need to reach for a pistol. I've really only ever done that 3 or 4 times, most of the time the rifle to pistol transition will happen in cover, as it should.