The VetGun Insecticide Delivery System is a unique system for delivering insecticide-filled gel capsules (AiM-L VetCaps, sold separately) to control horn flies and lice on cattle. AiM-L VetCaps burst upon contact to deliver the insecticide. The VetGun is powered by CO2 and can be utilized from 15' - 30' away. Simply aim, shoot, and treat. It's easy to operate, accurate, and reliable. Cattle are easily treated while milling around or feeding, without added stress or labor. Allows one person to easily apply insecticide from horseback, pickup, ATV, or while on foot. Saves time and puts you in control of when and where you treat your cattle. Includes two adaptors, allowing use with both 25 gm and 90 gm CO2 propellant cartridges (CO2 propellant cartridges or refillable CO2 tank sold separately).