Re: Sling use with bipod?
Any or all of the above work great.
You can also move your sling swivels to the off side (left side for most of us. All you need to do is order some QD swivel recievers, drill holes tight enough they thread in, and bed them in with devcon or JB weld.
There's no more comfortable way to carry a weapon whether it's over your back, over your shoulder or across your front.
Without the First and Second Amendments the rest of The Constitution is Meaningless.