After the hooked quillion was done away with in 1913, many of the earlier style bayonets were converted to this style by grinding off the hook. Further changes were made in 1916 when a 3/16" hole throught the pommel was added, to serve as a clean out for the bayonet lug track in the pommel. In 1926 the bayonets nomenclature was changed from the P-1907 to "Bayonet No 1 Mk I".