thick sheet steel, the M receiver was stamped in two halves that were then welded together. M은 스트라이커 발사 방식으로 발사되었으며, 볼트 내부에 고정 발사 핀이 포함되어 있습니다. The bolt was drilled longitudinally to support two parallel guide rods, upon which were mounted twin return recoil springs.