Glock 21 Gen 5 MOS

Published on December 23, 2024
Duration: 8:36

This review of the Glock 21 Gen 5 MOS in .45 ACP highlights its improved grip ergonomics compared to previous generations, particularly for larger calibers. The MOS system is noted as functional, and the firearm demonstrates surprisingly controllable recoil impulse, shooting flat and making target acquisition easy. Initial reliability concerns were resolved after a break-in period, with the firearm performing exceptionally well with AAC .45 ACP ammunition.

Quick Summary

The Glock 21 Gen 5 MOS in .45 ACP offers improved ergonomics over previous generations, with a more comfortable grip that shoots flat and exhibits controllable recoil. While initial reliability issues may occur, a break-in period typically resolves them, leading to excellent performance, especially with quality ammunition like AAC.

Chapters

  1. 01:12Introduction: Glock 21 Gen 5 MOS Review
  2. 01:50AAC Ammunition Sponsorship & Performance
  3. 02:16Glock 21 Gen 5 MOS Overview & Accoutrements
  4. 02:35Grip Ergonomics: Gen 5 vs. Gen 3/4
  5. 03:13Glock 21 Gen 5 Features: Mag Release, Slide Lock
  6. 03:34MOS Plate System & Optic Mounting
  7. 04:08Slide Serrations & Gen 5 Similarities
  8. 04:18Range Performance: Recoil & Shootability
  9. 05:08Future Aftermarket: Threaded Barrels
  10. 05:32Generational Comparison: Glock .45 ACP
  11. 06:37Is it the King of .45s? Competitors Mentioned
  12. 06:53Reliability: Initial Issues & Break-In Period
  13. 07:48Post Break-In Performance with AAC Ammo
  14. 08:26Conclusion & Final Thoughts

Frequently Asked Questions

What are the key ergonomic improvements of the Glock 21 Gen 5 MOS compared to older generations?

The Gen 5 Glock 21 features a significantly improved grip that feels more natural and comfortable for larger calibers like .45 ACP. Unlike the 'fat' Gen 3 or the restrictive finger grooves of the Gen 4, the Gen 5 offers a better grip angle and fills the hand well without backstrap additions.

How does the Glock 21 Gen 5 MOS handle recoil in .45 ACP?

The Glock 21 Gen 5 MOS demonstrates surprisingly controllable recoil impulse for a .45 ACP firearm. It shoots very flat, making it easy to stay on target for rapid follow-up shots, a testament to the Gen 5's recoil mitigation.

What was the initial reliability experience with the Glock 21 Gen 5 MOS?

Initially, the firearm experienced some feeding issues like stove pipes and failures to feed in the first few magazines. However, after a break-in period of about 3-4 magazines, cleaning, and lubrication, it became 100% functional and ran reliably.

Is the Glock 21 Gen 5 MOS ready for optics out of the box?

Yes, the Glock 21 Gen 5 MOS features the Modular Optic System (MOS), which allows for direct mounting of various red dot sights. The reviewer found the MOS system to be functional and robust, capable of co-witnessing with suppressor height sights.

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