X-699

X-699 is the name given to a Tau'ri project to develop Earth's first energy weapon.

This directed energy weapon was full functioning hand held plasma rifle that was demonstrated to the scientific community with attempts being made to portray it as a flawed technology. However, when an assassin attempted to kill Colonel Samantha Carter during the demonstration, the X-699 was rigged to fire a single stun blast that neutralized the threat of the assassin. (SG1: Bounty)