Urban Survival Principles: Automobile Glass

Published on June 8, 2025
Duration: 29:59

This video from Garand Thumb provides an expert analysis of firearm projectile performance through automobile glass, a critical skill for urban survival. Mike (Garand Thumb), a recognized subject matter expert with a background in Special Warfare, details the physics of glass types, the 'cone of deflection,' and how various calibers and ammunition types (5.56 NATO, 7.62x39mm, .308 Winchester, 12 Gauge slugs) perform against these barriers. The instruction emphasizes empirical testing and practical application for self-defense scenarios.

Quick Summary

Expert analysis reveals that shooting through automobile glass involves significant bullet deflection, typically 0.4-0.8 inches per foot traveled. Heavier calibers (.308 Win, 7.62x39mm) and 12-gauge slugs perform best, while 5.56 NATO with steel core (M855) is superior to OTM. Understanding glass type (tempered vs. laminated) and deflection is crucial for urban survival tactics.

Chapters

  1. 00:39Introduction to Urban Survival Principles
  2. 03:15Physics of Automotive Glass
  3. 07:53The Deflection Cone
  4. 10:115.56 NATO and Barrier Blindness
  5. 16:39Heavy Calibers: 7.62x39 and .308 Winchester
  6. 23:40Shotgun Ballistics on Glass

Frequently Asked Questions

How does bullet deflection work when shooting through car glass?

After passing through automotive glass, bullets typically deflect between 0.4 to 0.8 inches for every foot of travel. This 'cone of deflection' makes hitting targets accurately increasingly difficult as the distance from the glass increases.

Which firearm calibers are most effective for shooting through car windows?

Heavier calibers like 7.62x39mm and .308 Winchester show superior performance with less deflection. 12-gauge slugs are also highly effective. Lighter rounds and pistol calibers experience significant deflection.

Does ammunition type affect performance through car glass?

Yes, ammunition construction matters. For 5.56 NATO, M855 'Green Tip' with a steel penetrator performs better than 77gr OTM rounds against laminated glass. Heavier projectiles generally maintain integrity better.

What is the difference between side/rear car windows and windshields regarding ballistics?

Side and rear windows are typically tempered glass, shattering on impact. Windshields are laminated glass, designed to hold together, making them a more significant barrier that affects bullet trajectory and performance due to their multi-layer construction.

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