A Son'a disruptor pistol
Disruptor pistols were energy weapons similar to Starfleets phaser sidearms. The disruptor normally only had two settings: stun and kill. The Klingons, Romulans, and Breen used this weapon. (Star Trek Generations)
In 2371 Subcommander T'Rul of the Romulan military carried a disruptor pistol as her personal sidearm during the USS Defiant's first scouting mission into the Gamma Quadrant. When the ship was boarded by Jem'Hadar she killed at least one of the Dominion warriors with it. (DS9: "The Search, Part I")
Quark carried a disruptor pistol with him while serving as cook on a Ferengi freighter. As he explained it, the crew of the freighter were not overly fond of his cooking, necessitating the need to protect himself. In 2372, Rom used several parts of his brother's pistol to repair the bar's replicators, and had failed to return them by the time the Klingons were preparing to attack Deep Space 9. (DS9: "The Way of the Warrior")
Quark's pistol had been either repaired or replaced by 2375 when he accompanied the Defiant to AR-558. After his nephew Ensign Nog was wounded, Quark used it to kill a Jem'Hadar that broke into the Starfleet base camp. (DS9: "The Siege of AR-558")