In the alpha, when you got hit by a car, an explosion shockwave, or whatever to trigger the rag doll, you would lose your weapon. This is a nice feature, because weapons don't magically fly back into your hands. I suggest that there should be a good chance of losing your grip on your weapon when you rag doll. In real life if you get knocked over from an explosion you'll be rolling in the dirt to pick up your rifle. Losing you weapon shouldn't drop all your ammo, just what is already loaded in the weapon.