The Milwaukee 48081076 Standard Carriage is a replacement 310ml cartridge holder assembly designed for compatible Milwaukee C18 PCG 18V cordless caulking and adhesive guns. It accepts standard 250ml and 310ml tubes and cartridges, making it suitable for sealants, adhesives and other cartridge-based materials. The assembly includes the required plunger rod, piston and feed screw for use with compatible C18 PCG machines.