the cost you'd have to ask customer service, , the labor ,parts and shipping all have to be figured in..........yes, the barrel on your early "new model' would most likely be current production,, and may have the rollmarks for the "warning" underneath......never know what they may still have "in stock" ( on hand...)best to call them for ALL pricing..I know a week and half ago, they quoted me $305 to "update" an old model ,Single Six..the gun isn't worth that much, told them to send it back, and NO they would not do the safety update either?????