The long stroke gas piston system, exemplified by the AK-47 and M1 Garand, operates by redirecting gas to push a piston connected to the bolt carrier. This integrated system travels the full action length, offering simplicity and reliability due to fewer parts and increased momentum for extraction. However, its primary drawback is increased felt recoil from the heavy reciprocating mass impacting the receiver.
This video provides a detailed slow-motion analysis of the PKM general-purpose machine gun's operation. It highlights the open-bolt firing mechanism, the spring-loaded dust cover's actuation by the bolt carrier, and the unique pull-out belt feed system. The presenter, with clear expertise, explains how the enlarged and inverted AK action functions, emphasizing the delay between trigger pull and firing due to the bolt's travel.
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