The cocking piece you have now is the same as mine. I did learn that some early BSA-Spark's did come with the SMLE MkI cocking piece, my bolt is m/m so I cannot confirm this. If you want to make it a true Mk I* you will need to set it up for Mk VI ammo which is a higher profile rear sight base, "v" knotched rear sight, barley corn from sight and "LES" marked volley site plate. Also you will need to find a Mk II magazine, a Mk III will work but is not textbook. For finding parts a gentleman out of NZicon lists early SMLE parts on ebay, just keep an eye out!
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