Create a hyper-realistic 3D model of a monstrous AK-47 assault rifle. The gun should feature a sleek black crocodile skin texture wrapping around the stock and grip, giving it a rugged and scaly appearance. The barrel should resemble the open mouth of a snake, with venomous fangs protruding and glowing red eyes on the sides. Add monstrous features such as claw marks etched into the metal, bone-like spikes along the top rail, and a pulsating, vein-covered magazine that glows with a dark energy. The overall design should feel dangerous, alive, and demonic—blending modern weaponry with horror fantasy elements. Render in ultra-realistic 4K quality with high-detail shadows and reflective surfaces.