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Mizuno JPX850 Boron Forged Irons reviewed by Mark Crossfield PGA professional AskGolfGuru. Mark hits the new JPX850 iron with Boron forged design and some classic looks. This Grain Flow Forged golf club is aimed at many different standard of golfers looking for control with a some level help from the golf club. Play your best golf with Mark’s simple and easy to follow golf tips, reviews and fun videos.