In Madness Combat 4: Apotheosis, it re-appears with a more realistic design and is picked up by Hank. The gun in this has three settings: Safe, Semi and Mega. After Hank dispatches some grunts, he flicks the switch from "Semi" (semi-automatic) to "Mega," making the rifle fully automatic.
It also appears in Madness Combat 5: Depredation inside the car which Sanford and Deimos drive when they give Hank his dragon sword. It has appeared in nearly every animation since. It's most recent redesign is in Madness Combat 7: Consternation, where a stock has been added to the gun.
The AK-47 is also an automatic rifle featured in Madness Interactive and is able to kill a regular foe with two shots to the body. Although the AK-47 does not appear in Madness: Project Nexus, its smaller 5.45mm counterpart, the AK-74, does.
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To view an article on the AK-47 from Wikipedia, click here.