flares) have a primer in the base of the disposable launch tube. The cap contains a fixed firing-pin inside. The flare is fired by placing the cap over the base and striking it by hand. Hand grenades of the type that use a safety lever (such as the M26 grenade) use a striker that is similar to the classic spring-loaded mousetrap. It is held under tension until the lever is released and then flips over to strike the primer cap. Some chemical oxygen generators use a primer and mousetrap type striker to initiate the chemical reaction. Images References Firearm components