What is the system of operation of the SCAR-H MK17?

What is the system of operation of the SCAR-H MK17?

• A. Gas direct impingement
• B. Gas tappet
• C. Short-stroke piston
• D. Recoil operation

Answer: (B)

The SCAR-H MK17 cycles using a gas-operated setup that uses a tappet to drive the action. Gas from the bore is tapped off to push a small piston-like component (the tappet), which then transfers motion to the bolt carrier to cycle the action. This tappet-driven mechanism is what classifies its system as gas tappet. It’s not direct impingement (gas acting directly in the receiver) and not recoil operation (the barrel and receiver don’t recoil as a unit), and while it shares some ideas with short-stroke systems, the operative description used for the SCAR family is gas tappet.

The SCAR-H MK17 cycles using a gas-operated setup that uses a tappet to drive the action. Gas from the bore is tapped off to push a small piston-like component (the tappet), which then transfers motion to the bolt carrier to cycle the action. This tappet-driven mechanism is what classifies its system as gas tappet. It’s not direct impingement (gas acting directly in the receiver) and not recoil operation (the barrel and receiver don’t recoil as a unit), and while it shares some ideas with short-stroke systems, the operative description used for the SCAR family is gas tappet.