Its not just assault rifle (dmg boost for it is awesome addition imo) , its every weapon they use.
As i said 2 raiders crippled both of my legs and nearly killed me in couple turns, i kept getting knocked down
and they just crippled and crippled. I also have toughness x2 and used combat leather jacket.
Doesnt matter what it is, be it mauser , DE , hunting rifle , knife , fists , spear , minigun or anything. As long as its weapon wielding npc
they do monster crits and cripples all the time now.