I am guessing since it is a 22LR caliber that it may have come with a fake suppressor. Just for MAC10 look since I doubt that this could have been one that was grandfathered in since it is a 22 and not a 10mm like a MAC10 would be.
Huh? A 10mm MAC-10? No such animal. MAC-10's were made in .45 and 9mm, NEVER 10mm. A .22 would be a clone. A clone I am not familiar with.
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I must have been thinking of a variant made by another company that fires 10mm. There are several companies that make variants of the MAC10 since they went under and sold parts and frames of thier firearms.