The Gatling laser focus optics (abbreviated in-game to Gat. Laser Focus Optics) is a weapon mod for the Gatling laser in Fallout: New Vegas.
This mod increases the damage dealt by the Gatling laser by 3, from 10 to 13.
Prior to patch 184.108.40.2062, the focus optics were only worth 250 caps.
Gatling laser with the Focus optics modification