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First a minor point. The link pin does not have to be staked since it can't come out with the gun assembled, only when the barrel is removed; I would stake it myself rather than go to the trouble of sending it back, even if S&W does pay the tab.
On the Ruger, I have no good answer, but here are some thoughts. Clean is fine but 4-5 mags of even dirty factory ammo shouldn't be enough to cause a problem. Try this. Fire it until it quits, then set it aside for a 15-20 minutes, then try again and see what happens. If it runs OK for the same 4-5 mags and then fails again, I would suspect a heat problem, possibly either a tight bushing or a too tight lockup so that when the heat from firing causes the barrel to expand, you get failures.
The expansion could be radially, increasing the barrel diameter and causing a problem at the bushing or at the locking lugs, or lengthwise, causing a hangup in the fit of the barrel to the slide at the sides or rear.
Lesson for the day: Tight is not always right.
Jim
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