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The bolt he ordered seems to come with a new buffer but the kj I bought that came stock with the new bolt did not come with the updated buffer. I can not comment on the bolt catch because I have not compared them closely.
On a side not I would suggest pulling the new bolt apart upon getting and checking the piston rubber. On mine after one mag the piston head was showing signs of wear and a little shaving was hanging off already. I took 2000 grit wet sand paper to the spot to resmooth the blemish and have had zero issues since.
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