I know I've written this a couple times here....
Long way- run a couple thousand rounds through it. Repeat frequently.
Shorter way....
After ensuring it is indeed empty, hold down the slide release and cycle it through an entire episode of Jeopardy. Disassemble and use a crockstick, hard Arkansas stone,etc, to polish the wear marks on the action bars and minimize the flash left over from stamping. Radius the edges of the bars, lube then wipe off lube and reassemble. Finish by running a couple thousand rounds through it. Repeat last frequently.
HTH....