Gae Bong Soon does an unboxing and firing tests of the INF M4 Red Skeleton AEG. This a compact replica of the M4 ansd designed specifically for survival/airsoft games. It features an electronic trigger system that eliminates the need for a cut-off lever, thereby reducing single-shot twisting to a minimum. The gun is also equipped with a quick-type gearbox, which allows for easy replacement of the spring without the need to disassemble the entire gearbox.