If you consider the distance from the trunion to the locking point, the K-80 is at least 30% longer than most guns, and the locking point is at the very top rear edge bringing strength to the point of greatest torque on firing. So the K-80 has a significantly longer lever to hold the action closed. Besides, I think it was Greener who fired a gun without any locking lugs, just holding it in the normal manner, to demonstrate the torque was minimal anyway.