The HK Mark 23 and the HK USP .45 were designed around the same time and were made to take the heat. Though +P does obviously cause more ware than less potent loads these two handguns are for sure made to be able to go +P without a problem.
-- The more recent HK45 probably was built around the +P as well but I've not researched or shot one.
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Glocks are good but most of the owners of Glocks say negative things about the 1911 because...
a Monkey can't take it apart. - Int 2009
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