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In page FR F1:

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The FR F1 was designed around the 7.5×54mm MAS cartridge but versions in 7.62×51mm NATO also exist. It was equipped with a telescopic sight, French army standard issue being an Model 53 bis. Its practical range is 800 meters.[1] It is a very accurate sniper rifle, due to its quality, rear locking helical lugs that cam the bolt forward during closure to obtain optimal cartridge seating, free-floating barrel and efficient combined muzzle brake/stabilizer that dampens the barrel vibrations.