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Trigger mechanism in a bolt action rifle: (A) trigger, (B) sear, (C) striker spring, (D) striker. Thompson submachine gun trigger. A trigger is a mechanism that actuates the function of a ranged weapon such as a firearm, airgun, crossbow, or speargun.
A hot glue gun loaded with a glue stick. Hot-melt adhesive (HMA), also known as hot glue, is a form of thermoplastic adhesive that is commonly sold as solid cylindrical sticks of various diameters designed to be applied using a hot glue gun.