Weld Mount AT-388 Dispensing GunAT 388 Dispensing Gun The AT 388 Adhesive dispensing gun comes with a 10: 1 plunger. For Use With 50mL Cartridges of: AT 880 Note: The AT 388 will ONLY work with the AT 880 Polypropylene Adhesive Cartridge. The AT 880 is a 10: 1 mix ratio with a teardrop shaped cartridge, which will not fit in the other Weld Mount Systems dispensing guns. AT 388 Dispensing Gun The AT 388 Dispensing Gun has a 10: 1 plunger and can be used with 50mL AT 880 cartridges.