A New Enfield for a New War: The No4 MkI

Published on July 7, 2021
Duration: 19:28

The Lee-Enfield No. 4 Mk I, Britain's WWII standard rifle, evolved from the No. 1 Mk III* with significant design changes focused on accuracy and modern warfare. Key developments included the adoption of rear aperture sights, a stronger receiver, and a lighter spike bayonet. Despite trials starting in the 1920s, mass production was delayed until 1939 due to other priorities and the development of self-loading rifles.

Quick Summary

The Lee-Enfield No. 4 Mk I, Britain's standard WWII rifle, evolved from the No. 1 Mk III* with key improvements like rear aperture sights for accuracy and a stronger receiver. It also featured a lighter spike bayonet and a heavier barrel, though mass production was delayed until 1939.

Chapters

  1. 00:00Introduction: No. 4 Mk I vs No. 1 Mk III*
  2. 00:40Post-WWI Development & Aperture Sights
  3. 02:001931 Rifle Nomenclature Changes
  4. 03:01Mechanical Differences: Mk VI vs No. 4
  5. 03:51Receiver Markings on Trials Rifles
  6. 04:37Front Band & Sight Protector Details
  7. 05:53Muzzle Design & Accuracy Improvements
  8. 07:04The Cruciform Spike Bayonet
  9. 08:57Trials Patterns A, B, and C Explained
  10. 10:39Accuracy Focus: Sights & Adjustments
  11. 11:36Production Simplification for Mass Production
  12. 13:09UK Manufacturing Factories: Maltby, Fazakerley, BSA
  13. 14:30The 10-Year Delay to Production
  14. 16:08Fate of Trials Rifles & Sniper Conversions

Frequently Asked Questions

What significant design changes did the Lee-Enfield No. 4 Mk I introduce compared to the No. 1 Mk III*?

The No. 4 Mk I adopted rear aperture sights for improved accuracy, featured a stronger receiver with high walls, and utilized a lighter 8-inch cruciform spike bayonet instead of the older sword bayonet.

When did the Lee-Enfield rifle nomenclature change, and what did the No. 4 designation signify?

In 1931, the British changed their rifle naming system. The SMLE became the No. 1, the P14 became the No. 3, and the new trials design, which eventually became the standard WWII rifle, was designated the No. 4.

Why was there a significant delay between the trials of the No. 4 rifle and its mass production?

Mass production of the No. 4 Mk I, starting in 1939 for 1941 introduction, was delayed due to the British government's focus on developing self-loading rifles and prioritizing Bren gun production at the Enfield factory.

What role did the No. 4 Mk I play in the development of sniper rifles?

After the losses at Dunkirk, many early No. 4 Mk I trials rifles were refurbished. Approximately 1,400 of these were converted into the highly effective and sought-after No. 4 Mk I (T) sniper rifles.

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