I Sawed-Off a .50 Caliber Sniper Rifle...

Published on March 27, 2024
Duration: 22:28

This guide details the experimental modification of an HM Defense HM50B .50 BMG rifle's barrel, as demonstrated by Matt Carriker of Demolition Ranch. It covers the process of progressively shortening the barrel using a DeWalt chop saw, measuring the impact on muzzle velocity with a Caldwell chronograph, and observing changes in projectile performance. The guide emphasizes the importance of ATF compliance for such modifications and highlights the experimental nature of testing extreme barrel lengths, including a 'negative barrel' scenario.

Quick Summary

Modifying a .50 BMG rifle barrel requires ATF approval and involves significant changes in performance. Shortening the barrel drastically reduces muzzle velocity, impacting accuracy and terminal ballistics. Tools like abrasive chop saws and chronographs are essential for such experiments, and armor like the Hardcore Defense Bravo Shield can stop .50 BMG rounds.

Chapters

  1. 02:25Intro: HM Defense HM50B .50 BMG Rifle
  2. 03:55Control Testing & Setup
  3. 05:28Initial Target Assessment
  4. 08:42First Barrel Cut & Porting
  5. 12:06Extreme Shortening & Accuracy Issues
  6. 16:53The 'Negative Barrel' Test

Frequently Asked Questions

What are the legal requirements for modifying a .50 BMG rifle's barrel length?

Modifying a firearm's barrel length, especially shortening it, requires filing specific paperwork with the ATF and obtaining approval. Failure to comply with NFA regulations can result in severe legal consequences.

How does shortening a .50 BMG rifle barrel affect muzzle velocity?

Shortening a .50 BMG rifle barrel significantly reduces muzzle velocity. For instance, cutting the barrel resulted in velocities dropping from over 3000 fps to around 2600 fps, and further to 1751 fps after porting.

What tools are needed for experimentally modifying a rifle barrel?

Experimentally modifying a rifle barrel typically requires tools like a DeWalt abrasive chop saw for cutting, a shooting rest such as the Caldwell Hydro-Sled for stability, and a ballistic chronograph to measure velocity changes.

Can a .50 BMG round be stopped by Level III++ body armor?

Yes, a Hardcore Defense Bravo Shield rated at NIJ Level III++ was shown to successfully stop a .50 BMG round fired from the modified rifle at full velocity.

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