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$60.00HK 3-Lug adapter threaded 1/2-28. We sell dedicated 3-Lug barrels for the MAX-11 mk2, MAX-31 mk2 and MAX-31A mk2. If you already have one of our 1/2-28 threaded barrels, standard on these upper receivers, you can add this adapter to use your 3-Lug suppressor. Mounts to any 1/2-28 threaded barrel muzzle.