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Seems to be somewhat forgotten these days how much a correctly adjusted sling can steady a shot when wrapped around the front arm. Also there is plenty of situations it is good to have two hands free when climbing around.

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In mountains, rough country and especially if needing to carry out game kilometres back to camp or the vehicle without having a dozen blackamatics to do it all for you!

Your first point is also so true for non-multi barrelled firearms.