I've had several fixed choke Perazzi competition guns adjusted by Kenny Eyster of Centerburg, OH. Kenny has now passed on but his sons continue the business under the tradename: Heritage Gunsmiths. Jim apprenticed under his Father and is fully qualified to do this work. The process involves setting up the barrel on a specially adapted lathe, and using a DRAW REAMER with short flutes to slightly open the choke, at a tangent to the bore. They know how much to offset the tailstock to adjust for the POI you want. The process is time consuming and I'm sure it's not a $50.00 job, but if you want the best for a high quality gun, that's the place to go. The walls of the shop are covered with pics with autographs by some of the big names in the clays shooting disciplines..... gents who use the shop for their work. Silvers