PKM locking system?

PKM locking system?

• A. Tilting Bolt
• B. Rolling Lock
• C. Rotating Bolt
• D. Lever Lock

Answer: (C)

The PKM uses a rotating bolt locking arrangement. In this design, the bolt carries locking lugs that fit into recesses in the receiver. When fired, gas pressure drives the bolt carrier rearward and, thanks to the bolt’s cam geometry, the bolt rotates to unlock. Once unlocked, the bolt continues rearward to extract and eject the spent case, then returns forward to chamber a new round and lock again. This rotating-bolt system provides very strong, reliable locking for the PKM’s belt-fed, high-pressure operation and is well-suited to sustained fire. Tilting bolts are typical of some rifles but not used here, and rolling or lever lock concepts aren’t how the PKM’s breech is locked.

The PKM uses a rotating bolt locking arrangement. In this design, the bolt carries locking lugs that fit into recesses in the receiver. When fired, gas pressure drives the bolt carrier rearward and, thanks to the bolt’s cam geometry, the bolt rotates to unlock. Once unlocked, the bolt continues rearward to extract and eject the spent case, then returns forward to chamber a new round and lock again. This rotating-bolt system provides very strong, reliable locking for the PKM’s belt-fed, high-pressure operation and is well-suited to sustained fire. Tilting bolts are typical of some rifles but not used here, and rolling or lever lock concepts aren’t how the PKM’s breech is locked.