This reminds me of buying a gun at Cabela's a few years back. I had seen a Kimber 1911 45acp that I really liked. Went home and talked to the GF and the next day we both went back for a good look.
The counter guy was pretty nice, and I basically did everything you said, including dry firing (after asking of course). When I said I would take it, the guy put it back in the display case and said he would go grab me one from the back. I asked why I couldn't have the one I'd just looked at, and he said they couldn't sell the display unless it was the last one they had.
As a side note, my BIL bought the exact same gun on the same day, from the same store, about a half hour after I bought mine. The serial numbers are even sequential. Neither of us knew the other one had bought a gun until a few days later when I took it to show him, and he said "That looks just like mine!"
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chris