The 12 Pdr Armstrong Rifle was one of many artillery pieces designed by British inventor Sir William George Armstrong.
The Armstrong 12 Pdr Rifle, developed in 1855, had a 3 inch bore, came in both muzzleloading and breechloading versions, and could send a shell to a distance of over five miles.
The muzzleloading version of the Armstrong Rifle had a 3 inch bore, and the breechloading version had a 2.5 inch bore.
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