I've owned a carbine from hi-point (good deal, couldn't pass up). It was accurate and functioned flawlessly through about 500-1000 rounds (all I ever fired through it).
The gun sat in storage for a couple of years (clean, dry, lubed)... Then I took it out to a range one day and tried shooting it. Just a click sound that didn't sound very forceful. I haven't diagnosed the problem yet, but I think the firing pin spring wore out, or something.
I believe Hi-point claims to have a lifetime warranty, so perhaps I'll contact them. Shipping to send them the gun may cost more than the gun did, though.
These guns aren't premium by any stretch of the imagination, but until this recent problem mine had at least exceeded my expectations (accuracy, reliable feeding, etc).