EMIYA Alter, through unknown methods, modified Kanshou and Bakuya to function as bayoneted handguns, which he is able to trace and use in battle. It is with them he is able to use his Noble Phantasm, Unlimited Lost Works. He also shows the capability to transform them back into actual blades vaguely similar to the original swords, along with connecting them at their pommels to create a dual-bladed melee staff as well as lacking their Yin and Yang centers.
Kanshou & Bakuya (Handguns) in Fate/Grand Order.