With all of your favorable comments, I think I'm convinced to pick up one of these little carbines. Do you guys know if they all come with the vertical grip or is that special order? I can't tell from hi points website. What about spare clips, where can those be found and are there any hi capacity ones available?
If you notice on hi points website you can buy them with different accessories such as the vertical grip. Stay with the factory mags especially in the hi capacity. They do not like aftermarket mags for some reason from what I have found. I believe any hi point dealer can order them for you.
Can you actually get hi capacity magazines for the carbines?
pro mag makes the 15 round mags. Work in carbine and pistols. Works very well, you might have to adjust the "ears" out ever so slightly to feed smoothly.
15 round is the biggest I have seen.
EDIT: After looking at their website I don't see them but I do know they are available for them at least they used to be so I'm sure they still are. I would say if you called them at the number on their website they could help you with it.