A training/safety plug for use in firearms is provided. In one implementation, the plug comprises a chamber end and a shaft extending away from the chamber end. The chamber end is adapted to fit within a chamber of a designated firearm, the chamber end has a cross-sectional dimension sufficient to prevent the chamber end from extending into a barrel of the designated firearm and further comprises a strike surface for receiving an impact of a firing pin of the designated firearm and a proximal end dimension such that the chamber end is not engaged by an ejector mechanism of the firearm. The shaft comprises a barrel end coupled to and extending distally from the generally cylindrical chamber end; the barrel end of the generally cylindrical shaft further adapted to extend from the chamber end into the barrel of the designated firearm.