High Quality Content by WIKIPEDIA articles! The CheyTac Intervention is an American bolt action sniper rifle manufactured by CheyTac LLC for long range shooting. It is fed by a detachable single stack magazine, which holds 7 rounds. It fires .408 Chey Tac or .375 Chey Tac ammunition. CheyTac papers state that the entire system is capable of delivering sub-MOA accuracy at ranges of up to 2,500 yards (2,300 m), one of the longest ranges of all modern-day sniper rifles. It is based on the EDM Arms Windrunner.