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HUB, taper, and KeyMount are not three names for the same connection. They describe different suppressor-side paths. A muzzle device can have the correct 1/2-28 or 5/8-24 barrel thread and still be wrong for the suppressor the customer owns. The clean selection process has two halves. First, match the muzzle device to the firearm's thread and indexing surface. Second, match the muzzle device to the suppressor or adapter ecosystem. Start With the Barrel Thread Common shoulder-thread hosts use 1/2 …