How Does it Work: Long Stroke Gas Piston

Published on March 16, 2025
Duration: 1:00

This video provides an expert-level explanation of the long-stroke gas piston system, commonly found in AK-pattern rifles like the AK-47 and AKM. Ian McCollum details how the system functions, differentiating it from short-stroke systems and highlighting key components like the integrated piston, operating rod, and bolt carrier. The explanation emphasizes the full-length travel of these components and the duration of gas pressure application.

Quick Summary

The long-stroke gas piston system, as seen in AK-47 and AKM rifles, features an integrated piston, operating rod, and bolt carrier that travel the full length of the action. Gas pressure from firing drives this assembly rearward, facilitating cartridge extraction and cycling. Unlike short-stroke systems, the piston is not under direct gas pressure for its entire travel.

Chapters

  1. 00:00Gas Port and Block
  2. 00:13Firing Mechanism
  3. 00:28Long Stroke vs. Short Stroke
  4. 00:53Gas Pressure Duration

Frequently Asked Questions

What is a long-stroke gas piston system?

A long-stroke gas piston system is a firearm operating mechanism where the gas piston is integrally connected to the bolt carrier and operating rod, traveling the full length of the action. This design is famously used in AK-pattern rifles like the AK-47 and AKM.

How does a long-stroke gas piston system work?

When fired, gas tapped from the barrel pushes the piston rearward. This piston, being part of the bolt carrier assembly, drives the bolt carrier back, extracting the spent casing and cycling the action for the entire length of the cartridge's travel.

What is the main difference between long-stroke and short-stroke gas systems?

The primary difference is integration: in a long-stroke system, the piston and bolt carrier are one unit traveling the full action length. In a short-stroke system, the piston is separate and has a much shorter travel distance, striking the bolt carrier.

Which firearms use the long-stroke gas piston system?

The most well-known firearms utilizing the long-stroke gas piston system are the AK-47 and its variants like the AKM. This system is a key factor in their renowned reliability and durability.

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