Grease can get very thick under cold conditions and have the opposite effect. If you want a lighter pull, talk to a quality gunsmith. I do not advise the use of grease on any firearm, ever.

Using something like Break Free over extended periods of time (without using a solvent on the treated area) will create a buildup of teflon that will stay put and continue to provide excellent lubrication, even after the oil it was suspended in is gone.