After analyzing the friction tests I performed, I decided a wear test would be more valuable to shooters. I think the more important features of gun oils would be reduced wear and reliability. I’m going to address reduced wear right now.
How do you test gun oils for wear?
I decided the best way to test wear would be to move 2 metal parts against each other like the action of a semi automatic firearm. So I used the same inclined plane (extruded 6061-T6 bar) and sled to perform this test. I lubricated the Aluminum bar and the Aluminum sled and slid the sled back and forth on top of the extruded bar to imitate a firearm action. I then looked at the 2 surfaces to determine how much wear occurred. This would be compared with a bare metal test.
I decided to use Aluminum since it’s softer than steel and would wear easier too. So if an oil works well on Aluminum, it will work really well on a harder metal like steel.
Here is the 24″ long 6061-T6 Aluminum bar before the wear test.
Here is the 6061-T6 Aluminum Sled…polished with 400 grit sandpaper.
So I applied Rem Oil to the extruded bar stock and the bottom of the sled. I used a back and forth motion, sliding the sled on top of the bar stock with no downward pressure other than the weight of the sled itself. I performed 75 cycles. One cycle is sliding the sled up and then back, just like the action of a firearm.
Here is the sled after 75 cycles when lubricated with Rem oil.
The dark areas on the sled are microscopic aluminum particles that were worn off. You can see the 2 areas where the wear occurred. I’ll wipe off the residue so you can see how much metal wear actually took place.
On the left is Rem oil and on the right No Oil. Huge difference!
You can see the very slight wear on both ends…it’s the shiny area. Now lets compare this to bare metal.
You can see that there is much more wear and some slight galling on the sled. If you look at the horizontal scratch marks on left side of the sled. This is galling, which are deep scratches. The 24″ long bar also had deep scratches in the surface.
If you look carefully, you will see a very light streak in the center of the bar. These are deep scratches or galling.