I have a Fulton Armory built Norinco M14. Have been lubricating it with Tetra products suggested by Clint. Grease on roller, bolt lugs, bolt raceway, hammer hooks, and sear. Oil everywhere else. I haven't had an lubricant related issues with these products. Minimal wear, if any at all, and operates flawlessly.
On surfaces that slide and I feel I might at times potentially use quite heavily I like to clean them off very well to remove all traces of previous lubricant and then coat them with NECO high moly grease and really work the parts back and forth a LOT to try to get the moly plated down onto the surface of the metal. When I've grown tired of the working the moly onto the metal I then wipe the grease off of the parts as best I can and I hope I've left a good "dry" moly coating down on the metal surface.
I then go back and add a layer of Lubriplate right over the top of the moly coated metal surfaces for normal use.
My assumptions and hopes are as follows:
1- That the Lubriplate will provide the "primary" lubrication and I hope will never wear completely off before I replace it.
2- If for some reason the lubriplate does give up on me then that final layer of moly will keep the part lubricated until I can get lubriplate back onto the parts and thus prevent undue wear of the parts.
If it gets so cold I'm worried about cold grease causing a malfunction I wipe off all of the lubriplate and HOPE that the remaining moly on the metal surfaces will get me through a few winter hunting shots without fear of going "metal to metal" on the sliding surfaces.
I DEFINATELY get either oil or grease back onto the metal parts when the hunt or event is over as I fear rust forming on parts without that protection due to moly's reputation as not being a good rust preventative.
I have so far had no failures to fire/cycle despite firing at temperatures well below zero on the absolute F scale and who knows how low with wind-chill factored in. But I must point out I have NOT tested this "method" under a high volume of fire so can't comment on how well it might work with hundreds of rounds fired as opposed to less than the 10-15 I have actually fired myself with "only" dry-moly coating on the sliding metal surfaces.
I'll play odd man out. While I own more "high tech" (and expensive) greases like Tetra lube, due to the amount you use, I use plain old Hoppes Gun Grease for a couple bucks a tube. I use a Brownell roller greaser to lube the cam and the squirt some in the cam track and the space in the operating rod where the cam sits and smear it around with a q-tip. I have had no issues doing this and save my couple bucks an ounce Tetra for other uses.
I've used Tetra grease for many years nows having found how good a grease it is and how well it worked in combination with CLP another teflon based lube that I use as a general cleaner and preservative. I also use Tetra oil as a further lubricant for getting in those tight spots and an additional protective wipe.
There an excellent combo and I've haven't found anything better worth while to switch. Tetra's harder to find around rural Georgia where I'm at now, but I just order it from Midway when I getting various other things.
At this point I've got about 4 tubes around which will last a very long time even though I use the combo on all my firearms.
I did not read Lee's lubricant spec comparison, but am wondering how XF-7 weapons grease did in the study?
MD Labs XF-7 grease is one of over five dozen lubricants in the spreadsheet I've put together. XF-7 grease performs very well. It's pricey and you should not mix it with other greases on the rifle. IOW, be sure to remove all of the old grease and grime before applying XF-7. Otherwise, its performance can be degraded. However, your M14 type rifle will be well served with XF-7 grease. I use it on my scoped M1A since that is my M21A5 clone.
Some of the lubricant manufacturers have not made some of the various physical properties and test results for their products available. I've put all of the data points I can dig up into the spreadsheet for the lubricants listed therein. When you look at the spreadsheet comparison, that's why you don't see all of the data points filled in. That's one tab (worksheet) in the .xls file. There are other worksheets in the .xls file with additional information I think you'll find helpful and interesting.
I have been using Pennzoil wheel bearing grease on my rifles for the past 30 years. What's your opinion about good old fashion wheel bearing grease?
There are differences among the various makes and types of automotive grease and other types of grease. That's why I put this spreadsheet together. The military specifies a narrow band of values for the physical properties of rifle grease.
Pennzoil 707L Red Grease is in the lubricants comparison spreadsheet. The viscosity is higher than what the military specifies for rifle grease. Other than that, it falls in line with what the M14 needs. If you are using another grade of Pennzoil grease, let me know. I'll research it and add it to the spreadsheet.