What are the muzzle attachment dimensions?
To avoid unpleasantness if a 5.56mm muzzle attachment were screwed onto a 6.8SPC barrel, a different thread pattern is used: 5/8″x24tpi. This is the same as the Remington 700.[1] This is the thread pitch specified by the military. It has been reported that some other 6.8 barrels are using a 1/2-32 or -36 thread pitch. I have no other information at this time.
