SPEC 308 in Luger
 

For those not familiar SPEC 308 is the copper paste lube used by Glock from the factory that comes on their new pistols.

Now on a shooter luger, I like to keep them on the dryer side. I'll apply oil to the sides of breech block and rails, leaving a small film - but not wiped off like the rest of the gun. Action glides like butter when cycled manually.

I notice after a day, I'll take the gun down and it will be dry, as if the oil evaporated. And this will be without firing as well.

I was thinking for the sides of breech block and rails, you could use Glock's SPEC 308 as it will not run, and it should sure as heck not evaporate. Just a small amount smeared on each side of breech block and dots inside of slide rails should be enough for a shooter.

Any comments/ideas?

I have been using TW25b grease on the areas where the toggle train interfaces with the upper receiver. It is a bit heavier than an oil, and it stays put. I have been using this on all of my shooter handguns for a number of years with no complaints. New Sig handguns come with a tube of it in the box. Other gun companies may also, I don't know. I, personally, don't think that oil alone is enough of a wear preventive/lubricant for those areas. YMMV

On all the guns that I use at the range (1911 and Glock) I use a little bit of "Tetra" gun grease, sometimes I use one drop of "Ballistol" or Wilson Combat "Ultima Lube" oil.
When I've finished to clean my guns properly I give them a final touch with a silicone-cloth or with some cloth with a bit of "Finsuper" teflon oil.

In many years never had any problem.