Colt Model 1929 Prototype .276 Rifle, by Ed Browning

Published on July 22, 2016
Duration: 14:38

This expert-level guide details the disassembly and internal mechanism of the rare Colt Model 1929 semi-automatic rifle, designed by Ed Browning. It covers the short-recoil operation, tilting bolt, and accelerator system, explaining why the rifle ultimately failed to be adopted by the US military due to reliability and design flaws. The guide emphasizes careful handling and understanding of complex internal components.

Quick Summary

The Colt Model 1929 prototype rifle, designed by Ed Browning and chambered in .276 caliber, was a contender in US military trials for a self-loading rifle. It featured a short-recoil tilting bolt with an accelerator but suffered from reliability issues and part breakages, leading to its rejection.

Chapters

  1. 00:05Colt 1929 Introduction & US Military Trials
  2. 00:41Caliber (.276) and Designer (Ed Browning)
  3. 01:46Trial Performance Issues & Design Features
  4. 02:12Magazine and Disassembly Overview
  5. 02:281930 Trials Competitors
  6. 02:52Key Trial Flaws and Weight
  7. 03:29Recoil Operation Explained
  8. 03:57Tilting Bolt and Dust Cover Mechanism
  9. 04:24External Features and Markings
  10. 05:03Rear Sight Adjustment
  11. 05:36Initial Disassembly Steps
  12. 06:18Recoil Spring Mechanism Details
  13. 07:27Accelerator Functionality Explained
  14. 08:29Trigger and Safety Internals
  15. 09:12Barrel Shroud Cooling Design
  16. 09:43Bolt Assembly Dissection
  17. 10:44Firing Pin and Recocking Mechanism
  18. 11:34Bolt Face Components (Extractor, Ejector)
  19. 11:50Mechanism Summary and Internal Function
  20. 11:57Unlocking Action Demonstration
  21. 13:31Delayed Unlocking Explained
  22. 13:51Conclusion and Museum Visit Recommendation

Frequently Asked Questions

What caliber was the Colt Model 1929 prototype rifle chambered in?

The Colt Model 1929 prototype rifle was chambered in the .276 caliber. This cartridge was preferred for most testing during the US military's search for a new self-loading rifle in the 1920s, though logistical issues later led to a return to .30-06.

Who designed the Colt Model 1929 semi-automatic rifle?

The Colt Model 1929 semi-automatic rifle was designed by Jonathan Edward 'Ed' Browning, who was the half-brother of the renowned firearms inventor John Moses Browning. It was manufactured by Colt.

Why was the Colt Model 1929 rifle not adopted by the US military?

The Colt Model 1929 performed poorly in US military trials due to significant reliability issues, frequent part breakages, and an excessively long receiver. These factors made it impractical for service, despite its innovative short-recoil tilting bolt mechanism.

What type of action does the Colt Model 1929 rifle utilize?

The Colt Model 1929 utilizes a short-recoil operated action with a tilting bolt locking mechanism. It also incorporates an accelerator to speed up the bolt's rearward travel after unlocking, and features a brief delay before unlocking to allow chamber pressure to decrease.

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