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DrJohn...I bought a M 500 a couple of years ago. I would suggest lubing the action bars as mentioned and cycle the action repetedly until it loosens up. Mine is box stock and holding the gun in the strong hand and bumping the butt against my knee will open the action about 1/2 way. I know a guy that polished the action bars and a few spots inside the receiver on his 500 and he can fully cycle it open by simply giving the gun a quick jerk. It should loosen up and be very easy to cycle. My wife of 100 lbs has no problem operating mine. Chris in MO
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