Hello, does anybody know the diameter and thread size of the end of the FX Crown's shroud at the muzzle? In other words, when I remove the end cap on the shroud, at the muzzle, what are the interior(female) threads? I know DonnyFl makes the 1/2x20 adapter for the shroud but that doesn't help. I've looked everywhere and nobody seems to know. I'm having a silencer made that will screw directly on to the shroud, that's why I need to know. Any help would be appreciated. Stoti