The MK13 Mod 7 rifle is fielded by various US SOCOM units, in particular, US Marines MARSOC and US Navy SEALs.  Its lineage traces back to the Vietnam era M40, and is the last model of the infamous MK 13 Line of Sniper Rifles. 

 

Manufactured at NSWC Crane, the Mod 7 utilizes a Remington 700 Series action, chambered in 300 Winchester Magnum and embedded in the AICS rifle chassis made by Accuracy International of the UK.   The weapon system also includes a 7 x 35 Nightforce ATACR optic, and a Surefire SOCOM 762 RC suppressor.  The MK13 Mod 7 has an effective range over over 1200 meters.  It went into service in 2018.