History of Sightline Survey

Overview

Sightline Survey is a Legendary Arc Hand Cannon from Episode: Echoes (180 RPM frame). Like other Echoes weapons it carries the Radiolaria Transposer origin trait tied to Radiolaria fluid. Community roll guidance (TheGamer-style PvE picks): Triple Tap with Precision Instrument.

Acquisition

Destinypedia lists Sightline Survey among the Act 1 rewards of Breach Executable on Nessus. Its flavor text quotes Failsafe. Echoes weapons are Legendary and were not covered by sunsetting. None of the sources I opened confirmed whether a craftable pattern exists or an Adept variant, so check in-game. See also Weapon crafting and Episode: Echoes.