Glock 18 & 18C Machine Pistols: How Do They Work?

Published on March 3, 2025
Duration: 9:00

This guide details the internal mechanism of the Glock 18 and 18C machine pistols, focusing on how the full-auto function is engaged. It explains the role of the selector switch, the internal 'finger,' and the auto-sear function that enables continuous firing. The information is presented with high authority by Ian McCollum, an expert in historical and rare firearms.

Quick Summary

The Glock 18/18C machine pistol features a slide-mounted selector switch for fire mode selection: one dot for semi-automatic, two dots for full-automatic. Internally, a small 'finger' controlled by the switch engages an auto-sear tab on the cruciform sear as the slide closes, enabling continuous firing as long as the trigger is held. The 18C model includes barrel and slide ports for improved muzzle control.

Chapters

  1. 00:00Introduction and History
  2. 01:38Glock 18 Features
  3. 02:22Glock 18C (Compensated)
  4. 03:56Mechanical Differences and Compatibility
  5. 05:36Full-Auto Mechanism Explained

Frequently Asked Questions

How does the Glock 18/18C switch between semi-automatic and full-automatic fire?

The Glock 18/18C utilizes a slide-mounted selector switch. One dot indicates semi-automatic mode, while two dots engage full-automatic mode. This switch controls an internal mechanism that enables automatic firing when the trigger is held.

What is the purpose of the ports on the Glock 18C slide and barrel?

The ports on the Glock 18C's slide and barrel are compensators. They redirect propellant gases upward, effectively reducing muzzle climb and improving controllability during the high rate of fire associated with full-automatic operation.

Are Glock 18 parts interchangeable with standard Glock 17 pistols?

No, Glock intentionally made parts non-interchangeable between the Glock 18 and Glock 17. The frame rail heights differ slightly, preventing a Glock 18 slide from fitting on a standard Glock 17 frame.

What is the typical rate of fire for the Glock 18 machine pistol?

The Glock 18 machine pistol has a high rate of fire, typically ranging between 1100 to 1200 rounds per minute. This rapid firing rate necessitates features like compensation on the 18C model for better control.

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