You don't want to be on the other end of this weapon. The Chinese military's latest anti-materiel rifle, the QBU-10, can loft a .50 caliber (12.7mm) round as far as 1 kilometer and still hit its intended target. It weighs nearly 30 pounds. And even though it isn't designed to be as accurate as some sniper rifles, it still punches finger-sized holes in metal plates from up to a kilometer away. Stand back.
Hat tip: @KyleMizokami