I'm looking for a gunsmith who can tap the barrel and add a top rail to a Beretta Cx4. My eotech has been sitting on a shelf because I didn't realize you have to tap the barrel to add a top rail, it's not plug & play. Simple work, but not something I want to do myself. I also don't want to leave it in a store somewhere for weeks until some guy in the back gets around to it. Any ideas?