A. This is the barrel, whose rear forging forms a barrel extension with guides for travel in the receiver. The rear of the extension is hollow to receive the breechblock inserted from the rear. In early models, such as this one, the rear sight was also part of the breechblock forging. In later models, separate rear sights were used.
2 The breechblock with gripping wings at its extreme rear protruding from its entrance to the barrel extension in which it is housed.
4 Recoil spring compressor. This is a block inserted through the side of the barrel extension and through a slot in the breechblock. Its forward surface serves as a
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