In the heat of the az. desert. Oil seems to migrate. So after a short time you end up with dry rails. I got tired of this. I have used white lithium grease on my subgun ar's and ak's for several years with very good results. I started useing this grease on 1911's and hi powers. With very good results! I have been useing it on my c.o.r.e. and 9c. As said above little goes along way. Very cold weather I dont think it is a good choice. But here in the hot desert? All I use on autos