Machinegods can't use rings or amulets, as shown above. Ever wanted to try and stomp around as a Big Daddy? Here's... not really your chance. While you retain the firearms skill of the Daddies that trundle about in the dungeons, you're significantly less durable - good news is, kinda like Subject Delta, you're able to utilize magic, melee weapons, and firearms. You're also a much better shot with firearms than the standard Big Daddy models (especially since you're smart enough to get close with a shotgun, anyway).