A safety device for a revolver including an assembly adapted to be affixed to the revolver on opposite sides of the trigger guard, and a cylinder block connected to the assembly having a rigid leg for extending into a chamber to secure the revolver. The cylinder block includes a base having an aperture and a bent portion disposed between the aperture and the base. One or more pins extend from at least one of the side members for extending through the aperture for attaching the cylinder block to the assembly.