Wartime Evolution of the No4 Lee Enfield Rear Sight

Published on June 23, 2020
Duration: 7:27

The No4 Lee Enfield's rear sight evolved significantly due to wartime production pressures. Initially featuring a complex, micrometer-adjustable Mk1 sight, production bottlenecks led to the simplified Mk2 'L' flip sight. Later, stamped steel Mk3 and Mk4 sights offered a balance of adjustability and efficient manufacturing, though nomenclature could be confusing. Post-war production often reverted to the higher-quality Mk1 design.

Quick Summary

The No4 Lee Enfield rear sight evolved from the complex Mk1 micrometer-adjustable sight to the simplified Mk2 'L' flip sight due to wartime production bottlenecks. Later, the Mk3 used stamped steel for efficiency, offering adjustable ranges from 200-1300 yards, though markings could be confusing.

Chapters

  1. 00:00Introduction to the Mk1 No4 Lee Enfield Sight
  2. 01:15Wartime Production Bottlenecks & Mk1 Complexity
  3. 02:04The Mk2 'L' Flip Sight: A Simplified Solution
  4. 03:26The Mk3 & Mk4 Stamped Sights: Efficiency Gains
  5. 05:43Marking Confusion (Mk3 stamped 'Mk2') & Summary

Frequently Asked Questions

What was the original rear sight on the No4 Lee Enfield?

The original rear sight for the No4 Mk1 Lee Enfield was a high-quality, machined micrometer-adjustable sight. It featured a 400-yard battle aperture and a precision aperture adjustable from 200 to 1300 yards in 50-yard increments.

Why was the Mk1 rear sight replaced?

By 1942, the complex Mk1 sight became a major production bottleneck, particularly for American manufacturers. Rifles were ready for assembly but lacked rear sights, prompting the need for a simplified design to speed up production.

What are the key differences between the Mk1, Mk2, and Mk3 No4 Lee Enfield rear sights?

The Mk1 is micrometer-adjustable (200-1300yds). The Mk2 is a simple 'L' flip sight with fixed 300/600 yard apertures. The Mk3 uses stamped steel, returning to adjustable leaf design (200-1300yds) for efficient production.

What causes confusion with Mk3 No4 Lee Enfield sight markings?

Confusion arises because Mk3 sights are sometimes stamped 'Mk2'. This marking refers to the leaf itself being the second iteration of that specific part, not the overall sight assembly designation.

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