68-pounder Lancaster gun

68-pounder Lancaster guns were a British rifled muzzle-loading cannon of the 1850s that fired a 68-pound shell. It was designed by Charles William Lancaster. The cannon was designed with an oval bore and had a range of about 6500 yd. The gun had a tendency to burst and jam.

They were fitted in pairs to the Arrow-class gunvessel and were used during the Crimean War.

The muzzle of a Lancaster gun survives in the collection of the Royal Armouries at Fort Nelson.