After locating the life-giving device that the Kull armor is based on, Jacob and Sam were able to devise a weapon which would counteract the life-giving properties of the device. At full effectiveness, two shots at most will bring down a drone.
The prototype for the device was built using a Transphase Eradication Rod with a modified power cell. The technology was eventually scaled down into a palm-sized attachment that could be fitted to any weapon, such as FN P90 Personal Defense Weapons, eliminating the need to carry a second weapon. They were used extensively by the Tau'ri, the Rebel Jaffa, and the Tok'ra. (SG1: "Evolution, Part 1", "Death Knell", "Lost City, Part 2", "Reckoning, Part 2", "Avatar")