I'm not a "gun snob" (although I could probably pretend to be one ;^), and the following is merely an observation, and not intended as criticism. I think the Hi-Point carbine bolts are zinc alloy; that suggests they may not last as long as similar steel bolts. In other words, if I owned one, I would probably want to have a spare on hand (just for insurance). With that said, Hi-Point is an American company, and a lot of their customers love their products...
I went looking for the exact specs on the alloy composition of the Hi-Point carbine bolts, but haven't found it yet.
Being an owner, I can tell you that the bolts are heavy, rugged, and are over-engineered for their intended purpose. I follow the Hi-Point forum a lot, and have not heard of one breaking.
If one ever did, Hi-Point will replace it, no questions asked, and even ship your rifle back to you with a couple of free magazines.