bluegrassdan
Active member
- Joined
- Mar 25, 2025
- Messages
- 79
You don't cut the threads on the adapter until it is permanently/solidly attached to the barrel. That way, you indicate the bore concentric in the lathe, then cut your threads on the barrel, attach the adapter and lock it down, re indicate the bore to make sure it did not shift, then thread the adapter . If you have the barrel in the lathe and are doing all of that, you might as well go ahead and recut the crown- recessed to help prevent damage- to make sure it is exactly 90° to the bore line and the edges are nice and sharp. This way, since you are now only going to attach to the adapter, those threads run concentric with the bore. It eliminates any chance that the threads are off concentricity and run true. This assumes that the threads in the end cap of the suppressor or the end of the brake were cut concentric. That is why I insist on having whatever you plan on attaching, in the shop, on the bench, so I can verify that everything is running straight and true before it goes back to the customer.
