I have one, a 6 7/8" bbl stainless. It has been flawless since day one. Only time it has any problem is when it gets real dirty, then it's just a matter of swabbing out the chamber and breechface and boltface with a Hoppe's soaked q-tip.A Ruger Mk. II "Target."
C'est la vie said the old folks it goes to show you never can tell.