Colt M4A1 Carbine

Published on November 6, 2021
Duration: 6:04

Larry Vickers provides an in-depth review of the Colt M4A1 Carbine, detailing its military specifications including the 14.5-inch barrel, 'F' marked gas block, and double heat shield handguards. He discusses the evolution from burst fire to full auto and demonstrates its performance with Sellier & Bellot ammunition, highlighting the importance of proper sight height with flat-top receivers.

Quick Summary

The Colt M4A1 Carbine, chambered in 5.56 NATO, features a 14.5-inch barrel and weighs 6.5 lbs empty. Key components include an 'F' marked gas block for proper sight height on flat-top receivers and a Safe/Semi/Full Auto fire control group.

Chapters

  1. 00:26Introduction to the Colt M4A1
  2. 00:41Basic Specifications
  3. 01:00Barrel and Gas Block Details
  4. 01:38Handguards and Heat Management
  5. 02:15Optics and Receiver Setup
  6. 02:58Receiver Markings and Fire Control
  7. 03:12Stock and Buffer Tube
  8. 03:53Live Fire Demonstration

Frequently Asked Questions

What are the key specifications of the Colt M4A1 Carbine reviewed?

The Colt M4A1 Carbine features a 14.5-inch barrel, weighs about 6.5 lbs empty, and is chambered in 5.56 NATO. It has a Safe/Semi/Full Auto fire control group and 'US Property' markings.

Why is the 'F' marked gas block important on an M4A1?

The 'F' marked gas block is essential for M4A1 rifles, especially those with flat-top receivers. It ensures the correct front sight height, which is critical for proper sight picture alignment with the rear sight.

What type of handguards does the M4A1 typically use, and what are their characteristics?

The M4A1 often comes with double heat shield handguards. While they offer some protection, they can trap heat during sustained firing, a point noted by Larry Vickers.

What distinguishes the M4A1's fire control from earlier models like the M16A2?

The M4A1 Carbine features a Safe, Semi, and Full Auto fire control group. This differs from the M16A2's Safe, Semi, and 3-round burst configuration.

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