Breech Loading Swival Gun $1250 Extra Breech Mug $300. • Certified Proof Tested • Lifetime Quarantee • Fully functional cannon with touch hole • 1 Caliber or 1 inch bore • All steel construction, 1/2 inch thick • Includes 2 breech mugs and pintle • Uses 200 grains of black powder • Allows for a higher rate of fire than a muzzle loading cannon • Barrel length 32.5 inches