I realize this is an old thread, but it was the closest to my question. I'm patiently waiting for my Form 4 approval for a Silencerco Harvester. In 3DHuskers pictures the lower one is the situation I have. On a RRA ATH carbine the threads do not have the undercut at the shoulder junction. I also have a SOTA arms barrel with similar thread/shoulder junction. The SOTA is a 6.8SPC and has a washer/shim between the barrel and muzzle brake which appears to square things up. Could I use the washer between the suppressor and barrel? Would it be better to just have the barrels re-cut? Trying to save some money here but don't want to mess up the can. Any advice is greatly appreciated.
Bobby
Bobby