Chamfering GP100 cylinder

I know it's not the answer you requested but it's actually pretty easy to do on your own with a simple chamfering tool you can order from a distributor like Brownells or the like. I did a few of my revos.
 
Greg Derr did a nice job on my S&W Model 19. He had it reblued, replaced the front sight, chamfered the charge holes, and did a nice trigger job.
 
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