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You would need to use abrasives with a hard, flat backer, like a granite surface plate. You'll need to avoid rocking across the high spot and hitting the corners on each far side (hard to explain, but if you 'rock' across the stamp, you risk over-sanding the muzzle or butt end of the slide.)
I would suggest Sharpies or Dykem to track your progress and ensure you're hitting the stamp without causing excess wear anywhere else, and if you don't know exactly what you're doing, consider a pro for either some help or the whole job.
Larry
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