What is the SCAR-H MK17 system of operation?

What is the SCAR-H MK17 system of operation?

• A. Gas tappet
• B. Gas piston
• C. Direct impingement
• D. Recoil operation

Answer: (A)

The main idea here is that the SCAR-H MK17 uses a gas-operated, short-stroke piston system that uses a gas tappet to cycle the action. When a round is fired, some propellant gas is diverted through a port to drive the tappet, which engages the bolt carrier and pushes it rearward to unlock and extract. A return spring then pushes the bolt forward to chamber a new round and lock again. This setup keeps hot gases away from the receiver and provides reliable cycling in harsh conditions. It’s different from direct impingement, where gas acts directly on the bolt carrier inside the receiver, and from recoil operation, where the whole firearm’s backward movement drives the action.

The main idea here is that the SCAR-H MK17 uses a gas-operated, short-stroke piston system that uses a gas tappet to cycle the action. When a round is fired, some propellant gas is diverted through a port to drive the tappet, which engages the bolt carrier and pushes it rearward to unlock and extract. A return spring then pushes the bolt forward to chamber a new round and lock again. This setup keeps hot gases away from the receiver and provides reliable cycling in harsh conditions. It’s different from direct impingement, where gas acts directly on the bolt carrier inside the receiver, and from recoil operation, where the whole firearm’s backward movement drives the action.