TR - 116 rifle The TR - 116 rifle was a hand - held projectile weapon developed by Starfleet Security during the 24th century . History . The rifle was developed by Starfleet Security for use in dampening field s or radiogenic environments where conventional energy weapons would be useless . It was designed to fire a chemically propelled tritanium bullet ; in this , it was functionally very similar or perhaps identical to gunpowder arms . A working prototype of the weapon was developed , but Starfleet opted not to produce the weapon after the advent of the regenerative phaser . The TR - 116 could be operated by both right and left - handed shooters . In 2375 , Science Officer Chu ' lak used a TR - 116 rifle to murder fellow Starfleet officer s Hector Ilario , Greta Vanderweg , and Zim Brott aboard the Bajoran space station Deep Space 9 . Chu ' lak modified the rifle with a micro - transporter , which allowed him to beam the bullet into another room , only 8 - 9 centimeters from its target . An exographic targeting sensor allowed Chu ' lak to scan through walls and target victims anywhere on the station from his quarters . Lieutenant Ezri Dax later used a similarly modified rifle to stop Chu ' lak . ( ) Appendices . Background information . The TR - 116 and its accompanying targeting sensor were designed by Production Illustrator John Eaves based on the Breen phaser rifle first seen in . " [ The script ] " called for this wild rifle with a transporter device attached to the barrel accompanied with a special headset sighting goggle . " " Eaves recalled . " " We used one of the Breen rifles as the basic body and detailed and added all the extras to convert the piece into a new and deadlier weapon , the prototype TR - 116 rifle . " " Eaves also believed the weapon to be chambered for . 30 caliber rounds . ( ; " " , p . 650 ) The prop rifle itself was constructed of resin painted black and grey with rubber grip dressings , additional chrome accents and strap , and measured 35 inches in length . It was later sold off in the It ' s A Wrap ! sale and auction for US $ 2 , 716 . 00 . One of the Breen rifles incorrectly labelled as a TR - 116 was also sold off for US $ 2 , 500 . Of the scene in which the weapon is introduced , the script for " Field of Fire " describes , " " Behind them , the doors OPEN allowing O ' Brien to ENTER carrying a high - tech rifle and wearing a targeting device on one eye . A small box - like device has been attached to the muzzle of the rifle . " " Director Tony Dow wasn ' t sure the weapon was going to work in " Field of Fire " due to the complexity of its design . " " I thought it essential that we really see the insides of the walls " " , he recalled . " " I mean , actually go through a wall so that the audience understood what was happening . " " ( " " , p . 651 ) Visual Effects Supervisor Gary Hutzel was charged with creating the " seeing through walls " effect of the weapon . " " The magic gun that shoots through walls ! " " he joked . " " But that wasn ' t the gag so much as that you could " see " through the walls . That drove a whole lot of aspects of the effect . It had to look as if Ezri was looking through a scope toward a target that was a great distance away . " " Hutzel ' s team built a section of wall with its interior wiring and other components exposed . They then shot the prop wall from various angles so it could be used multiple times . Following this , they re - arranged the walls in the set that normally serves as Sisko ' s quarters , creating a number of smaller rooms . Inside these rooms , they photographed various extras . " " In order to get the right appearance , we had a Steadicam operator run sideways past a number of smaller rooms so that the walls would be foreshortened in the foreground . " " Hutzel explained . " " That gave everything the appearance of extreme distance , and the Steadicam gave it a handheld look , as if Ezri were looking through the targeting display . The operator had to run like nobody ' s business back and forth across the set and then come to a sudden stop , emulating Ezri ' s movements . He would run , run , run and stop , run , run , run back and stop . " " ( " " , p . 651 ) Apocrypha . In the " " novel " Lesser Evil " , Lieutenant Sam Bower s tells of his experiences aboard the during the Battle of Sector 001 . The " Budapest " was one of a handful of Starfleet vessels equipped with prototype TR - 116s . When the Borg attempted to assimilate the ship and its crew , Bowers led a security team equipped with TR - 116 rifles through the ship , with orders to eliminate any and all Borg drone s . Because the weapon s used projectiles instead of energy beams , the drone ' s deflector shield ing was useless , and the " Budapest " crew were successful in stopping the Borg . Though these events are not mentioned in " Field of Fire " , the statement about projectile weapons being effective against the Borg is at least partly supported by the scene in , during which Jean - Luc Picard uses a holographic Thompson submachine gun to kill two Borg drones . In the novel " A Time to Heal " , a Starfleet security sniper uses a TR - 116 to stun Tezwan guards . It is noted that the gun can " shoot through walls " , indicating that Chu ' lak ' s modifications may have been adapted for field use . In the " " novel " Lost Souls " , the TR - 116 is stated as using 10mm monotanium slugs . The weapon is later used to defeat a Hirogen boarding party and in the capture of a Borg vessel during the year 2381 . The TR - 116 rifle also appears as a " rare ground weapon " with a limit of one per character in the video game " Star Trek Online " . Players who pre - ordered the game through either Target or GAME received the weapon for free . When the game ' s crafting system was overhauled , the TR - 116 B - variant was added as a craftable weapon , thus making the rifle available for all players . The weapon can also be crafted by players in " Star Trek Timelines " for use by the rare character " Sniper Ezri Dax " , who holds the weapon in her left hand . In 2007 , released an Ezri Dax action figure complete with TR - 116 rifle and eyepiece .