I know the AKM uses a lug on the gas block since the bayo hooks on right in front of the front sight and the butt of the bayo reaches back to the gas block to clip on there. On the 74, because of it's long buzzle brake, the bayonet sits further forward and clips on at the FSB. So why did they keep the lug on the gas block? Especially since they were designing a new one anyway. Is it necessary for attaching the grenade launcher? Just a weird thing I noticed.