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.
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