Chisato uses a Detonics CombatMaster .45 ACP, with the strike face compensator and iron sights designed from a Tokyo Marui Strike Warrior 6mm BB gun. The gun is based on a M1911 frame design, but it isn't a Colt M1911, it is a derivative, so the "m1911" tag does apply. Source: https://www.imfdb.org/wiki/Lycoris_Recoil#Pistols