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

Published on March 3, 2025
Duration: 9:00

The Glock 18 and 18C are select-fire machine pistols developed for military and law enforcement. The 18C features a compensated barrel and lightened slide to manage its high rate of fire (1100-1200 RPM). Key internal differences, like higher slide rails, prevent Glock 18 slides from fitting standard Glock 17 frames to deter illegal conversions.

Quick Summary

The Glock 18C improves controllability during full-auto fire with a lightened slide and barrel ports that redirect gas upward, reducing muzzle climb. Its high rate of fire (1100-1200 RPM) is managed through these design features.

Chapters

  1. 00:00Introduction and History of Glock 18
  2. 01:38Glock 18 Features and Selector Switch
  3. 02:22Glock 18C Compensated Design Explained
  4. 03:56Glock 18 vs Glock 17: Mechanical Differences
  5. 05:36Full-Auto Mechanism Breakdown

Frequently Asked Questions

How does the Glock 18 differ from the Glock 17?

The primary difference is the Glock 18's select-fire capability, enabled by a rotary selector switch and internal auto-sear mechanism. To prevent illegal conversions, Glock also made parts non-interchangeable, notably with higher slide rails on the Glock 18 frame.

What is the purpose of the Glock 18C's compensated barrel?

The Glock 18C features barrel ports and a lightened slide specifically to manage the high rate of fire (1100-1200 RPM) of the machine pistol. These ports redirect gas upward, reducing muzzle climb and making the firearm more controllable during full-auto fire.

How is the full-auto function activated on a Glock 18?

A rotary selector switch on the slide controls the firing mode. In full-auto mode, a small 'finger' on the switch engages a specialized tab on the cruciform sear as the slide closes, acting as an auto-sear to release the striker immediately upon going into battery.

Can a Glock 18 slide fit on a standard Glock 17 frame?

No, Glock intentionally designed the parts to be non-interchangeable to prevent illegal conversions. The slide rails on a Glock 18 frame are positioned slightly higher than those on a standard Glock 17 frame, meaning a Glock 18 slide will not fit a regular semi-automatic frame.

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