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The .50 BFG is a Special Forces sniper rifle sold at Wizard Island from Trust level 2. It hits harder than almost anything in the game and holds 10 rounds. Bring it for Reachers, Ragers and anything you want dead in one shot.
It shows up in the Wizard Island gun merchant's stock once your Trust there hits level 2. That puts it in the back half of the game.
It is built for big single targets: Reachers, Ragers, Breakers and armored humans at range. Penetration is high, so one shot can pass through lined-up enemies. Ammo is pricey, so do not waste it on Swarmers.
The Talon 7 hits hard too but holds only 5 rounds, or 7 upgraded. The SSR fires faster with less punch per shot. The BFG sits between them and is the best all-round pick for big game.
BND-150
The BND-150 is an experimental IPCA sniper rifle that exists only in New Game Plus. It unlocks once you finish the main story again in that mode. It fires 6mm rounds and three craftable dart types, which makes it the most flexible special weapon.
C8 Rifle
The C8 Rifle is an Average-condition semi-automatic sniper rifle for the special slot. It lets you take precise shots from far away. The Lost Lake merchant sells a magazine upgrade that takes it from 5 to 7 rounds.
M40
The M40 is a Poor-condition bolt-action hunting rifle used as an early sniper. Its magazine is broken, so it loads one round at a time. It hits hard and reaches far, but you will want a better rifle soon.
SSR
The SSR is a semi-automatic sniper rifle with a large magazine and no delay between shots. You get it as a reward near the end of the main story. It suits hectic fights where a bolt-action would be too slow.