The 7-inch Rifled Breech Loading (RBL) gun (110-pdr) was developed by W.G. Armstrong in 1861. It was the first breech loading gun to be used for coastal defence, with a unique screw breech mechanism.
Just under a thousand of these guns were built, and many remained in service until the end of the century. However, they quickly fell out of favour as a main line armament and by 1865 were being replaced by Rifled Muzzle Loading (RML) guns.
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