But emory's case wasn't a warranty job.
While I'm here I'll say that for a non warranty job they moved pretty fast! Also, yeah, a squib alone should not ring the barrel, but if it did, what the hey?
And also I agree that it was an ammo issue and S&W were gracious to do the work free.
If it wasn't a warranty job, why then were there no charges? And why did a barrel ring or crack from a squib load? My point is, that it 'smells' like a belatedly acknowledged warranty job.