Glock 21 Gen 4

Published on July 29, 2012
Duration: 13:36

This expert review by Military Arms Channel provides a deep dive into the Glock 21 Gen 4, comparing it extensively with the Glock 21 SF. The instructor, Tim, offers an objective assessment, highlighting the Gen 4's dual recoil spring, modular backstraps, and improved magazine release. He also discusses practical aspects like barrel compatibility, the use of aftermarket barrels for lead reloads, and accuracy testing, concluding that the Gen 4 offers reliable combat accuracy.

Quick Summary

The Glock 21 Gen 4 features a dual recoil spring assembly and an improved, larger, reversible magazine release. While its polygonal rifling isn't ideal for lead bullets, aftermarket barrels are available. Accuracy is consistent 'combat accuracy' at 15 yards, with an MSRP of $680.

Chapters

  1. 00:00Introduction and Initial Shooting
  2. 00:36Comparison with Glock 21 SF
  3. 01:13Gen 4 External Features
  4. 02:05Internal Changes: Recoil Spring
  5. 03:11Parts Compatibility
  6. 04:07Lead Bullets and Aftermarket Barrels
  7. 05:12Magazine Release and Grip Texture
  8. 06:27Reliability and Performance Theory
  9. 07:33Accessories and Unboxing
  10. 08:21Recoil Comparison Test
  11. 09:42Lone Wolf Barrel Testing
  12. 10:24Accuracy Testing
  13. 11:01Final Verdict and Pricing

Frequently Asked Questions

What are the key internal changes in the Glock 21 Gen 4 compared to previous generations?

The most significant internal change in the Glock 21 Gen 4 is the introduction of a dual recoil spring assembly. This system differs from the single spring found in older generations and required a modification to the slide's front diameter.

How does the Glock 21 Gen 4's magazine release compare to the Glock 21 SF?

The Glock 21 Gen 4 features a significantly larger and reversible magazine release, which is considered a major ergonomic improvement. The Glock 21 SF had an ambidextrous release, but it was less prominent and later modified.

Can you use lead bullets in the Glock 21 Gen 4's polygonal rifled barrel?

It is generally not recommended to use lead bullets in Glock's polygonal rifled barrels due to potential lead buildup. An aftermarket barrel with traditional rifling, like those from Lone Wolf, is suggested for shooting lead reloads safely.

What is the typical accuracy expected from a Glock 21 Gen 4?

Accuracy testing at 15 yards indicates the Glock 21 Gen 4 offers consistent 'combat accuracy,' performing reliably and comparably to previous Glock 21 models in this regard.

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