I just bought my twin colt saa 4 3/4 with ivory grips and nickel. I took one out shooting, and at the end of the day, I noticed a squeaking sound when I cock the hammer. Sounds like it's from at least two spots, one of which sounds like a spring. How do I oil this new gun, and with what? Thanks for your imput.
Depends on a couple of things. Is your Colt new or new-to-you? Assuming a new gun, it would then depend on how extensive your shooting session, again, assuming the gun was clean to begin with. If you're shooting regular smokeless, I'd just hit it with Rem Oil. Spray it liberally, making sure to get the barrel, cylinder and any of the interior you can access through the various holes.
For real dirty guns or ones that I've used with black powder, I disassemble the gun and scrub it with soapy, hot water. I then rinse thoroughly with HOT clean water, making sure to get all traces of soap off. I will then spray it down with a good water displacing oil or the like. Lastly I oil it and go over it with a rag to remove excess lubricant.
Obviously, I don't clean the grips the same way. Sorry to say, but I usually just wipe the grips clean with Rem Oil. This has worked for me with wood, gutta-percha, and even antique Elephant Ivory.
Make sure the oil and cleaner you use is compatible with nickel. Some solvents aren't.