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I cant answer for MSL, but my reasons are: Barrel sits lower and doesnt catch, so a long barrel still carries easily. lowers centre of gravity / balance point of rifle so it 'hangs' and doesnt swjng,...

The Niggeloh with the forward strap around the barrel. Nothing better. Wont slip off shoulder and the slight stretch cushions and absorbs jumps and bumps so the rifle doesn't bounce.