The Model 64 .38 special +P is still being sold and given the purchase date, these are not vintage S&W revolvers. This could be a QC issue after all. Not good for S&W's new American owners if true.
2004 vintage would have the floating firing pin, as opposed to the one mounted directly on the hammer. In my experience, these are more likely to have FTF if the mainspring is messed with, or the strain screw is backed out. This might be the fault of a shadetree armorer in pursuit of a lighter DA pull.
This vintage would also have the much reviled internal lock.
The barrel issue looks like QC to me.
I have owned a variety of S&W hardware over the years, but
sold all but my trusty Model 64, bought used in the middle
`90s. The last new Smith I bought was an utter piece of junk,
and even after making S&W replace it, the replacement gun
was as bad or worse. I don't trust S&W anymore, especially
after their sellout during the Clinton anti-gun crusades.