European militaries are showing growing interest in a technology that turns standard service rifles into last-resort drone killers, an Israeli weapons maker says, as countries look for cheaper ways to counter the surge in uncrewed systems. A representative of firearms manufacturer Israel Weapon Industries told Business Insider that at least 10 European countries have either purchased or shown interest in the Arbel system, a micro-computer intended to better optimize a gun for shooting down drones, since Russia's full-scale invasion of Ukraine began in 2022.