Front site comes off easier from left to right.
I just did mine last week.
Back site comes off when you punch out HARD while in a vise.
Laying it down did not work, had to be in a vise.
A few guys on RimfireCentral had to use a dremel to cut theirs out.
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The scariest words in the English language: I'm from the government and I'm here to help! President Ronald Reagan