Why did we start shooting 9mm?

Published on March 28, 2026
Duration: 13:05

This video discusses the historical shift in firearm caliber preferences, particularly the move from .45 ACP and .40 S&W towards 9mm. It emphasizes that shot placement and shooter skill are paramount, regardless of caliber. The discussion also delves into the process of customizing firearms, differentiating between essential needs and desirable wants, and considering factors like trigger pull, sights, and ergonomics.

Quick Summary

Historically, 9mm handguns were often avoided by US law enforcement and military due to perceived lower stopping power compared to .45 ACP and .40 S&W. However, effective threat cessation relies primarily on accurate shot placement into vital areas, making the shooter's skill paramount regardless of caliber. When customizing firearms, prioritize essential needs like reliability and sights over aesthetic wants.

Chapters

  1. 00:00Introduction: Bridging the Gap
  2. 00:46Historical Law Enforcement Caliber Restrictions
  3. 01:02Tier One Units and Caliber Choices
  4. 01:39Why 9mm Was Shunned: Early Perceptions
  5. 01:53American Handgun History: Big Bore Preference
  6. 03:099mm Introduction and Early Reception in America
  7. 03:53US Army Adopts 9mm: Impact on Popularity
  8. 04:04The Real Problem: Ammunition Effectiveness
  9. 04:21Shot Placement: The Key to Stopping Power
  10. 05:039mm vs. 45 ACP: Effectiveness Debate
  11. 05:37Personal Preference: 45 ACP vs. 9mm
  12. 06:04The Shooter Makes the Difference
  13. 06:29Handguns as Tools: When to Use Them
  14. 06:47Personal Experience: Law Enforcement Caliber Mandates
  15. 08:01The Shift to a 9mm World
  16. 08:44Custom Firearm Builds: Needs vs. Wants
  17. 09:20Essential Firearm Features: Functionality
  18. 09:25Sights and Triggers: Importance for Accuracy
  19. 09:44Trigger Pull Weight: Range vs. Carry
  20. 10:33Additional Customization: Grip and Checkering
  21. 11:00Beavertail Grip Safety: A Personal Need
  22. 11:13Ambidextrous Safeties and Other Features
  23. 11:23Finishes and Stocks: Addressing Rust and Aesthetics
  24. 11:52Determining Your Needs and Wants
  25. 12:17Budgeting for Custom Firearms
  26. 12:30Pride of Ownership
  27. 12:49Conclusion: The Evolving 9mm Landscape

Frequently Asked Questions

Why did law enforcement and military units historically avoid 9mm handguns?

Historically, 9mm was perceived as less effective at stopping threats compared to larger calibers like .45 ACP and .40 S&W. Law enforcement and military units often mandated these larger calibers due to concerns about terminal ballistics and immediate incapacitation.

What is the primary factor determining a firearm's effectiveness in stopping a threat?

The primary factor is accurate shot placement into vital areas of the human body, such as the central nervous system or major blood vessels. Caliber size and bullet design play a role, but a well-placed shot from a 9mm is generally more effective than a poorly placed shot from a .45 ACP.

What are the key considerations when customizing a firearm, differentiating needs from wants?

Needs are essential features for reliable function and safety, like a dependable action, clear sights, and a manageable trigger pull. Wants are features that enhance comfort, aesthetics, or performance beyond necessity, such as checkering, fancy grips, or specific finishes.

How does trigger pull weight affect firearm performance and safety?

Lighter triggers (2.5-3 lbs) offer greater precision for range shooting, while heavier triggers (4-4.5 lbs) provide a safety margin for carry guns, reducing the risk of accidental discharge under stress or in adverse conditions.

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