One of the best sniper rifles of the US Army is the MK13.
The Mk13 is a bolt action sniper rifle that recently replaced the Marine Corps’ M40 sniper rifle. Adopted in 2020, the Mk13 is now used by scout snipers and Recon Marines as well as Navy SEALs and other SOCOM units. 
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The newer rifle, chambered for .300 Winchester Magnum ammunition, adds 300 meters to its effective range over its predecessor and is issued to snipers with a suppressor to reduce muzzle flash and the acoustic signature