Common optical sights:[]
Kel 8 red dot: unlocked at the tutorial,[]
Theg 4x: earliest available scope, can often be found at the weapons case on the west side of the tunnel on mt akiyama.[]
Theg 8x: can often be found at the hidden smuggling area at the trading center.[]
Mars 8x: can be found on snipers obtained by the 1 million luna return long range kit[]
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