Which term describes the MG3's locking mechanism?

Which term describes the MG3's locking mechanism?

• A. Rollers
• B. M17/M18 Locking System
• C. Disconnector
• D. Recoil W/Gas Assist

Answer: (A)

Roller locking describes the MG3’s locking mechanism. In this system the bolt head carries two hardened rollers that engage recesses in the barrel extension/trunnion. When a round fires, the high-pressure gas pushes the bolt backward, and the rollers hold the bolt in a locked position long enough for the chamber pressure to drop. Once pressure falls, springs retract the rollers, the bolt unlocks, and the bolt closes to cycle the next round. This roller-delayed blowback setup is characteristic of the MG42 family, including the MG3, providing reliable function with the power of 7.62×51 mm. The other terms don’t describe the locking method: they refer to different parts of the fire-control or operating system, not to the roller-based locking used here.

Roller locking describes the MG3’s locking mechanism. In this system the bolt head carries two hardened rollers that engage recesses in the barrel extension/trunnion. When a round fires, the high-pressure gas pushes the bolt backward, and the rollers hold the bolt in a locked position long enough for the chamber pressure to drop. Once pressure falls, springs retract the rollers, the bolt unlocks, and the bolt closes to cycle the next round. This roller-delayed blowback setup is characteristic of the MG42 family, including the MG3, providing reliable function with the power of 7.62×51 mm. The other terms don’t describe the locking method: they refer to different parts of the fire-control or operating system, not to the roller-based locking used here.