Which is the locking system of the SCAR-H MK17?

Which is the locking system of the SCAR-H MK17?

• A. Tilting bolt
• B. Rolling bolt
• C. Rotating bolt
• D. Fixed bolt

Answer: (C)

Locking the breech under pressure is the key idea here. The SCAR-H MK17 uses a rotating bolt system. In this design, the bolt carries locking lugs that engage recesses in the receiver, and the bolt rotates to lock as the bolt carrier drives it forward. When firing ends and pressure drops, the carrier turns the bolt to unlock, and the bolt travels rearward to extract the spent case. This rotating-bolt arrangement provides solid lockup and reliable cycling with 7.62x51mm ammunition across demanding conditions. A tilting bolt would lock by tilting instead of rotating, which isn’t how the SCAR-H MK17 operates; a fixed bolt wouldn’t unlock for extraction, and a rolling bolt isn’t the mechanism used here.

Locking the breech under pressure is the key idea here. The SCAR-H MK17 uses a rotating bolt system. In this design, the bolt carries locking lugs that engage recesses in the receiver, and the bolt rotates to lock as the bolt carrier drives it forward. When firing ends and pressure drops, the carrier turns the bolt to unlock, and the bolt travels rearward to extract the spent case. This rotating-bolt arrangement provides solid lockup and reliable cycling with 7.62x51mm ammunition across demanding conditions. A tilting bolt would lock by tilting instead of rotating, which isn’t how the SCAR-H MK17 operates; a fixed bolt wouldn’t unlock for extraction, and a rolling bolt isn’t the mechanism used here.