Back in about 1983, a Sgt Maj, USMC Ret. told me that oil was a rust preventative and grease was a lubricant. Granted, he fought in the days of Garands and M14's, but would some type of high temp grease be a better lube for our M4's? Seems like it would stay put better than oil and maybe last longer.
Anybody ever tried this? If it's a no-go, why? If so, what works?
Also, is there a non-toxic grease out there (I love Slip2000 because it won't kill my liver).

