Do the raiders ever cap out on weaponry?

I've noticed that the raiders are getting better and better weaponry each time they raid? Will this eventually stop? Is there some upper limit or will I eventually need the best weaponry in the game just to fend them off?

Solution 1:

No, they won't stop coming. First they all start carrying machetes, then pistols, later on hunting rifles. Then a few of them start carrying Laser Pistols. Either Laser Rifles or Plasma Pistols come next, followed by the other. Then it was the Plasma Rifles. And now it is the Railway Guns.

Don't know what will come next.

The door will only hold them for a few seconds, so you can prepare and get your best soldiers to the vault door and the next rooms.