A perforating gun system includes a cylindrical outer housing, a charge carrier assembly receivable in the outer housing, wherein the charge carrier assembly includes a charge carrier defining an interior configured to at least partially receive one or more shaped charges, a first endplate coupled to a first end of the charge carrier, and a second endplate coupled to a second end of the charge carrier, and wherein the first endplate defines a switch receptacle for at least partially receiving an electrical switch and a detonator receptacle for receiving a detonator such that the detonator is configured to detonate the one or more shaped charges in response to receiving a firing signal from the electrical switch.