Most MFGs employ REPs to advertise and represent their product. I assisted a Sig Sauer rep last year, allowing the public to try different pistols. Shoot, reload. Shoot, reload. This went on all day. This particular rep gave me the impression he cleaned them often, but when he has 10-15 dirty guns at the end of the day and another "range day" or another DEMO the next day, and the next, etc, i'm sure some get overlooked. To me, those were DEMO guns. If not dropped or left wet after a rain soaking, after a good cleaning job and inspection they should be as good as if you or I had put the same # rounds thru.............