Cannon Bowsling

The Cannon Bowsling was a Vreigardt/Vista traditional ranged weapon, also known as a "rock-thrower" - "Lančend Mila"
An elastic propulsion mechanism for rocks, and small cannonballs, it took the form of a long, sturdy oaken staff with inlaid metal handles for grip. Near one end, a few metal rings along one side acted as a targeting sight, and there was a guide rail along the staff. On the other end, there was a windlass that winched a heavy drawstring with a concave iron cup, drawing the attached ropes taut. When it was primed, the wielder placed a small projectile in the iron cup. When the drawstring was released using a switch-catch, the projectile flew off at rapid speeds. 
A cannon bowsling required some strength to wield and winch, but was easier to carry, use, and maintain than a heavier-weight bow or an expensive cumbersome crossbow - it was only surpassed by modern flintlock rifles.
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