Quoted:
Brake says it comes with shims but there is only a single thick spacer in the pack. Is there supposed to be more? Not sure how one spacer would help timing it to the torque value stated.
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The slim "spacer" is actually a custom crush washer. We had to custom manufacture a crush washer just for .620" diameter barrels. Standard ones would "flare" and exceed the OD, defeating the purpose of the slim device.
Installation instructions:
-Install the crush washer onto the barrel with the "nub" side facing the threads shoulder.
-Lightly thread on the muzzle until it just starts exerting pressure on the crush washer with your hands.
-Use the flats to the muzzle device to slowly turn the muzzle device until it is timed. These custom crush washers only have about 230 degrees of crush, so once one side is aligned - STOP!
Let us know if you have any further troubles. We are very happy to assist in any capacity.