I took a picture of one of the bores (they all looked about the same)

Not much rifling, but lots of rust and corrosion.

I asked my buddy Ted what he thought might be the best thing to remove the rust, and being an old Sailor, he suggested Naval Jelly.

I got some and started to clean the bore of the first rifle.

I dipped a .308 caliber bore brush in the jelly and ran it into the bore.

I let it soak as per instructions, and then patched it out.

Here's what came out.

I did it again, and again, and again.

They got cleaner, little by little.

When it looked like it was as clean as it was going to get, I cleaned up the barrel with the normal methods.

It was still rough, but looked a lot better.