The M1905 bayonet was shortened to a 10" blade in 1943. These bayonets are often referred to as the M1905E1. All types and dates of the 16" blade M1905 bayonets were used to convert to the shorter style. They were ground to either a spear or knife point. (SA, RIA, AFH, OL, PAL, UC, UFH, & WT).