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I don't know of anything similar in New Vegas, though.
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Best bet would to go to a NCR camp and hope there is a guy with a sniper. This mod adds two models of the russian sniper rifle SVD. Fallout New Vegas: Best Starting Gun RatSlayer SNIPER Location (Beginner Guide) - Duration: 4:27. Christine's CoS silencer rifle is a unique weapon in the Fallout: New Vegas add-on Old World Blues. The weapon is highly accurate, being able to put accurate fire from over a mile away. The weapon features new projectiles, new textures, new meshes, and a rather beautiful explosion.
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This mod adds a very large sniper rifle, known as the Hyena Infra-Dead to Fallout: New Vegas. Fallout 3 has a sniper rifle hidden in a secret rock right at the start of the game. The gun deals extremely high damage but fires very slowly.
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