Take the bolt apart (easy as)
Polish the rest of the finish off the finish
Be careful not to remove Material you just want to remove blueing
Once its all a even finish Boil the jug
And drop the part in a cup of hot water
Alternatively a few swipes with a torch
Then put your cold blue on
You get a much better finish With hot material
Other option (not sure if this would be recommended for a jw15 bolt handle as it includes the locking lugs and the heat will some what soffen lugs
Is you carefully heat the part with a Torch until the part goes dark blue
Then quench in oil
You could stop at a dark purple Colour for a case harden look
Which would look quite cool
Im just not sure about heating the part that is responsible for locking the action I don’t know if I would to be honest
But works really well on things like screws and thread protectors etc part that arn’t part of the main function and may Cause a safety Hazard
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