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If I KO my opponents Battle Master and it has a Dismantling Claw on it, and it scraps my Dismantling Claw, I think my Dismantling Claw would therefore scrap the newly applied Battle Master due to he is now a weapon on my opponents bot. Is that correct?

That is correct.
Source: Wizards of the Coast (2019-08-09)    【Link to Ruling】
Tags: Triggers