For 6 points and a gear slot this upgrade adds the Precise 1 keyword to a unit, allowing them to reroll 1 additional die when spending an aim token.
At 6 points targeting scopes is quite expensive, especially if you are upgrading multiple units with them. 4 targeting scopes costs more than a DLT-19 or a Z-6 for reference and often don't make up the damage output difference in an entire game that a single weapon upgrade will make in one turn. However for units who spend aim tokens multiple times a game or get aim tokens for free it can be a valuable addition.
The best unit for targeting scopes currently is Fleet Troopers, as they will often get a free aim with their standby action, and have lots of low accuracy dice. It is also valuable for Snowtroopers who are getting an aim token from veers or outside themselves. Targeting scopes is also very useful on Luke; when he is in melee he can only spend his second action on an aim or dodge and often aiming on Luke's melee attack brings his damage average way up.
Rebel Trooper Expansion, Fleet Trooper Expansion, Stormtrooper Expansion, Snowtrooper Expansion