The Model 1770 had a modified lock plate, stronger barrel bands, and a modified retaining spring. The Model 1771 moved the bayonet lug and strengthened the barrel. The Model 1770 and 1771 are often grouped together as a single model. The Model 1773 was similar to previous models, but again modified the scouring stick-retaining spring. The Model 1773 is often considered to be a minor variant to the Model 1770/1771. The Model 1774 had a shorter trigger guard, and the tail of the steel was cut square. The scouring stick-design was also modified in the Model 1774, giving it more of a pear shaped head. Similarly minor changes were made for the Model 1776, which is often not considered to be a separate model.