What is the Locking System of Rising Barrel?

• A. M17/M18 Locking System
• B. MG3 Locking System
• C. M17/M18 System of Operation
• D. Rollers

Answer: (A)

Locking systems describe how the barrel and bolt lock together during firing and then unlock to restart the cycle. For rising-barrel designs, the exact arrangement is given a specific name that identifies how the barrel rises and locks with the bolt. The M17/M18 Locking System is the recognized designation for this particular locking arrangement in rising-barrel action. It specifies the exact geometry and interaction that makes the rising-barrel mechanism function, setting it apart from more general descriptions of operation or from other locking methods.

The MG3 Locking System refers to a locking method used in a different firearm family, which uses its own distinct mechanism. Describing the M17/M18 as a system of operation would be too broad, since that covers the overall cycle rather than the specific locking engagement. Rolling components like rollers describe a type of locking method used in some designs, but they don’t name the rising-barrel locking arrangement itself.

So, the best answer is the M17/M18 Locking System.