An apparatus comprising: a gun, wherein the gun includes a yoke defining a first mounting and alignment feature; and an accessory mount for the gun, the mount comprising: a base configured for attachment of the accessory mount to the gun, wherein the base comprises a bracket having a second mounting and alignment feature that is complementary in shape to the first mounting and alignment feature, a holding mechanism for fixing the position of the base in relation to the gun, wherein the holding mechanism comprises at least one threaded fastener extendable through an aperture in the bracket and into a corresponding threaded aperture in the yoke while the first and second mounting and alignment features are engaged with each other, and an elongated accessory mounting arm coupled to the base and extending forwardly therefrom, the arm comprising a beam having a vertical web with at least one flange disposed at an upper and/or a lower end thereof, wherein the bracket includes a pair of forwardly extending slots in a side surface of the bracket facing away from the gun, the slots being configured to receive a side surface of a rear end portion of the accessory mounting arm in a complementary engagement, and at least one threaded fastener extending through at least one through aperture in the accessory mounting arm and into a corresponding threaded aperture in the bracket. a gun, wherein the gun includes a yoke defining a first mounting and alignment feature; and an accessory mount for the gun, the mount comprising: a base configured for attachment of the accessory mount to the gun, wherein the base comprises a bracket having a second mounting and alignment feature that is complementary in shape to the first mounting and alignment feature, a holding mechanism for fixing the position of the base in relation to the gun, wherein the holding mechanism comprises at least one threaded fastener extendable through an aperture in the bracket and into a corresponding threaded aperture in the yoke while the first and second mounting and alignment features are engaged with each other, and an elongated accessory mounting arm coupled to the base and extending forwardly therefrom, the arm comprising a beam having a vertical web with at least one flange disposed at an upper and/or a lower end thereof, wherein the bracket includes a pair of forwardly extending slots in a side surface of the bracket facing away from the gun, the slots being configured to receive a side surface of a rear end portion of the accessory mounting arm in a complementary engagement, and at least one threaded fastener extending through at least one through aperture in the accessory mounting arm and into a corresponding threaded aperture in the bracket. a base configured for attachment of the accessory mount to the gun, wherein the base comprises a bracket having a second mounting and alignment feature that is complementary in shape to the first mounting and alignment feature, a holding mechanism for fixing the position of the base in relation to the gun, wherein the holding mechanism comprises at least one threaded fastener extendable through an aperture in the bracket and into a corresponding threaded aperture in the yoke while the first and second mounting and alignment features are engaged with each other, and an elongated accessory mounting arm coupled to the base and extending forwardly therefrom, the arm comprising a beam having a vertical web with at least one flange disposed at an upper and/or a lower end thereof, wherein the bracket includes a pair of forwardly extending slots in a side surface of the bracket facing away from the gun, the slots being configured to receive a side surface of a rear end portion of the accessory mounting arm in a complementary engagement, and at least one threaded fastener extending through at least one through aperture in the accessory mounting arm and into a corresponding threaded aperture in the bracket.