Lee Enfield parts have grown through an evolutionary process along with the Lee Enfield rifles, it can be pretty baffling to know exactly what variation you have or need.
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Top- No1, Lower – No1Mk3
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Top – No1 circa 1905, note sight blade enclosed by ears plus stacking swivel hole/screw. Bottom – No1 Mk3 1907 1st Variation, note smaller, more open ears plus stacking swivel hole/screw.
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Top – 3rd Variation, note opened sight ears for sight adjusting tool plus no stacking swivel hole. Bottom – Ishapore 1966 4th Variation, square sight ears and body cuts plus stacking swivel pillar is removed.