[crp]

The inside surface of the SS slide on my AE USP.45 has turned a deep gray color by, I think, old gunpowder residue. EEzox won't remove it. Any suggestions? Old-fashioned bore cleaner? TIA

PS: The outside surface is perfect.

 

[gtmtnbiker98]

It's friction wear, doubt that you can touch it with a solvent. You'll have to have it sand blasted to remove it.

 

[Kost]

Dont bother with the inside finish as long as its not rust, its just the aged 'patina' of the stainless steel, and should not be an issue. Keep it clean/oiled and attempt to 'shoot the rails off' your USP =)