I've noticed a big difference between various gun greases and TW25B in the action parts of my Sig. TW25B is the best, but it's too expensive for me. Lubriplate 105 is very similar and it's a fraction of the cost.
http://www.brownells.com/gun-cleanin...?sku=311003010
I've been using Lubriplate 130 for the rails, and it's definitely a lot thicker, but it does keep the Sig rails looking new after thousands of rounds.