Dispensing Gun The dispensing gun is used to extrude impression materials and bite registration materials from cartridges. It consists of a release lever and a plunger, which are coordinated simultaneously to load and remove the cartridge. The gun also consists of a trigger to dispense the material. Works with 1:1 and 2:1 cartridges. VP-8202- for 1:1/2:1 HP Cartridge- 50ml VP-8204- for 4:1/10:1 Cartridge- 50ml