"...Slinging basically ties the rifle to your left arm..." Nope. It's not in any way tied to your arm. Your arm comes out of the sling immediately. It's mostly a long range shooting aid. Most combat video is staged.
"...Unlike bipods..." Nobody uses a bipod except MG'ers and maybe snipers. For the PBI, every ounce matters and bipods add unnecessary weight.
"...the proper use of a sling will improve..." Absolutely.
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