I am going to say my Magnum Research 10/22 with a collapsible stock. It is very light, can be short for discreet carry, easily carry enough ammo. With the different loads of ammo that are now available, there is almost something for everything. You can have 40gr bullets going around 1500 fps, or 60gr bullets going around 950fps. I like my 5.56s, but there has always been a 22lr in my safe.