I've put the requirements of MIL-G-46003-A Grease, Rifle into a spread sheet on lubricants. I've researched about thirty different lubricants and put the data into this spread sheet for comparison. Some data was not available through searches online but there's quite a lot in it already.
If you would like a complimentary copy of this comparison spread sheet of lubricants, just send me a request to
leeace99@hotmail.com I'll delete your e-mail upon reply. You will not be added to any marketing list.
I also put together a FAQ on M14 Preservation and Soft Lubricants here:
www.imageseek.com/m1a
The thing that surprised me the most from MIL-G-46003-A, the USGI military specification, is that the M14 is really designed for a grease with a NLGI rating of 2.5. A NLGI rating of 3 is in specification. NLGI # 2 grease is at the high end to just above the limit for consistency (worked penetration test per ASTM D217). IMHO, NLGI # 2 grease is fine as long as the oil viscosity is in the proper range, 108 to 172 centiStokes at 100 degrees F. You'll just have to replace it a "skosh" more often than NLGI # 3 grease. But that can be fun too.
I have to make two qualifications with the following choices: 1) I'm ignoring the water resistance (ASTM D1264) results because most of the manufacturers don't provide them online 2) there's hundreds of greases on the market and the spread sheet only covers thirty or so. Out of the thirty I got data on, these are my top five picks.
1) Fiske Brothers Refining Co. Lubriplate 930-A
2) Fiske Brothers Refining Co. Lubriplate 630-A
3) Mobilith AW-3
4) Valvoline Durablend
5) Plews & Edelmann Red Lithium Complex Equipment Grease
Bottom line, if you use a calcium or lithium based grease with NLGI rating of 2 or 3, you're good to go.