The only blued gun which I carry regularly is my S&W M36 which is carried in my pocket. I oil it after every range session or once a month, whichever comes first. I've been carrying this gun pretty regularly for a couple of years now and haven't had any issues with rust though that might be a different story if I lived near the ocean. Honestly, if I lived near the ocean, I'd probably be looking into a M60 or other stainless gun for carry and relegate my M36 to enjoyment at the range.
Smith, and Wesson, and Me. -H. Callahan
Well waddaya know, one buwwet weft! -E. Fudd
All bad precedents begin as justifiable measures. -J. Caesar