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Yes, the muzzle is threaded 1/2x28, the black ring on the end of the barrel in the picture is the knurled thread protector it comes with.

George, yes Sir. This pistol has a 4.4 inch 1/2-28 Threaded Barrel with thread protector. Pictures here : https://www.deguns.net/ruger-mark-iv-lite-22-45-22lr-4-4--green/p