I sent a suicide squad of useless migrants at it with copper machetes/sledgehammers. Little to no effect. By the way, in case anyone wanted to know, the shell/bullet casing determines the metal type, not the bar used in making them.
They did almost nothing because its chitin is as strong as copper and is 2 times as thick as other chitin if it was on a regular sized scorpion

Also I noticed 2 bugs I guess you could call them in the gun raws. Basicly you need the same ammount of stuff for a military rifle as you do a hunting rifle, so the read me was wroung about that, and the pistol is acculy better in every respect other then mass compaired to the hunting rifle, as the pistol has the same shooting force as the rifle. Just thought I would let you know.
Oh btw this was in 1.08 so and I havent got 1.09 yet so idk if it changed or not.
Gona get 1.09 after this fort goes to shit.