I use it to run a line of paracord from my mp7 stock right to my shoulder. Works like a dream, just hit the stock release and push forward and you can get right to shooting.
If you know the enemy and know yourself, then you need not fear the outcome of a hundred battles.
If you know your enemy and not yourself, for every victory earned, you will also suffer a defeat.
If you know neither the enemy or yourself, you will succumb, in every battle. -Sun Tzu