LOCKING SYSTEM Above: Right side view showing barrel at rear end of its recoil stroke. In this design note that the barrel slides back locked to the breech mechanism until it passes completely over the magazine. At that point the breechblock is automatically held back by its catch, and the compressed barrel return spring pulls the barrel forward. While the rear section of the breechblock is held securely by the catch, the front bolt-head section is free to turn. The barrel pulling on the bolt head acts through the feather on the bolt to twist it until the lugs come free from their seats in the receiver, thereby unlocking the action so the barrel can complete its forward movement alone.
Below: Solid and sectional views of the breechblock showing its two-piece construction.
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