Working on a brake for a buddy for his kids T/C Compass 6.5 creedmore. Gun is out of state so just trying to save the hassle of shipping it back and forth. It is a pre threaded barrel and according to T/C website its a 5/8 24 tpi thread. I just need the barrel diameter at the shoulder so I can taper the brake to the diameter. If you are able to confirm the thread size and tpi that would be awesome too, before I tap it. Thanks in advance. My buddy doesn't have calipers and frankly not sure I would trust his measurements

.6535

Thank you