WATCH: Irish kickboxer scores brutal one punch knockout in Dublin last night

There's not a whole lot of give in 4 oz MMA gloves.

So when two established kickboxers don the lighter gloves and start swinging, there can be some nasty results. On this occasion it was Karl McCallig who came off second best in his K1 rules bout against Blue Dragon Muay Thai's Keith Levins when the pair met in the National Basketball Arena last night. It was a looping left hand from the southpaw Levins that landed square on the button and turned the lights out on McCallig at the Cage Kings event. https://instagram.com/p/6KcadECmeY/ H/t to Jake Gibbons and FightStorePro