A percussion fuse for use in projectiles includes a cylindrical bore in a housing and a carrier in the bore for supporting at least one primer and which is moved to a fusing position where it may be detonated following firing of the projectile. A resilient deformable seal ring is attached to the carrier and is deformed by the walls of the bore during movement therethrough to retard movement of the carrier and delay fusing. A multiple position stop device may be used to stop a selected one of a plurality of different primers at the fusing position.