Gun Masters on Ave K in Plano is not my cup of tea. I did not care for the staff and the "new" gun that I looked at was dry as a bone. No packing grease. It as a bit rusted too. I've never seen a Ruger SP101 in stainless rust. I owned A GP100 for 15 years with no signs of rust and I put 15,000 rounds down the barrel.
That's weird. I've been in there twice in the past week and the first time I watched them sell a new Sig that was covered in lube (I even commented to my wife who was with me). The second time (today) a guy bought a brand new M1A that was likewise well lubricated. I only saw one Ruger GP/SP in there today and it was in the consignment case. I've purchased several guns from Gun Master and never had this problem though. Or any problem, for that matter.
I did find the following reply to a post on Rugerfurom.net dated July 17th, 2012 though: "[FONT=arial, geneva, lucida, lucida grande, arial, helvetica, sans-serif]Once the rust is removed, please do yourself a favor and order some Eezox. It is hands down the best preventative coating I have ever found.[/FONT] I had rust on my GP100 [FONT=arial, geneva, lucida, lucida grande, arial, helvetica, sans-serif]and my Remington 870. Cleaned them up, coated them with Eezox and never had an issue. All my guns now get cleaned and coated with Eezox. I am such a huge believer in the product that if it doesn't work for you, I will buy it from you." (emphasis added).
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And the original post was by a guy complaining about rust developing on his NIB, stainless P-90.
So I guess it's not unheard of, but my mother's SS SP101 and my Vaquero never had any problem. **shrug**
Fred B.