Smooth—Smooth-Mechanism guns apply more consistent pressure to the cartridge, so flow continues between trigger pulls. These guns are often used with thick materials that require strength to dispense and maintain flow.

Dual Cartridge Capacity—Guns with a dual cartridge capacity give you more time between refills and let you mix two-part compounds.

Thrust Ratio—To choose a thrust ratio, consider the thickness of the material—thinner materials such as silicone and latex flow easily, so choose a low thrust ratio gun. Thick materials such as urethanes and epoxies require more power to dispense, so choose a high thrust ratio.