You can turn it down to 9/16x24 , turn to 1/2x28 and use a 5/8x24 thread adapter with a .750" shoulder or have the shoulder turned back and pick up the threads and have about 1.25" of 5/8x24 threads and permanently attach a thread protector leaving about .6-.625 of exposed threads. A concentric shoulder can be turned on the protector and have the protector blended to the barrel. A few ways to skin the cat.