The minor diameter of a 1/2-28 thread is 0.456", which with a .308" bore means your barrel is going to have 0.074" walls, and a stress riser from the threads. Most barrel makers recommend a 0.125" wall thickness for barrels.
There's a good reason the 5/8-24 thread is used with the 30 caliber, as well as a reason 1/2-28 is not used.
That was my thought as well. Kimber uses an even smaller thread diameter, the 7/16-28, on almost all their threaded barrels. Seems awfully thin to me but Kimber said they had no issues using that thread pitch with .30 cal barrels. They also said it was originally intended for muzzle brakes but could also be used with their adapter for suppressors. Still seems awfully thin. Will be intesesting to see how they hold up over time.
