your spare mag, more than 2nd rifle. It makes for a GREAT way to enjoy shooting, even indoors, with wax ammo, and if you aint fast enough, all the power and accuracy in the world are useless. A timer is a HUGE help for seeing what's helpful as to speed, and what's slowing you down. Many times, a move will "feel" fast, but the timer will show you that it was not That's because you had "wasted motion" in the move. You can at olympic speed around the block, I can JOG across the block and still beat you to the far side.