This is going to take the post a little off topic, but it is on the subject of a pistol caliber carbine. I picked up a(nother) used Hi Point 9mm carbine that had a scope and an ATI stock on it (so it kinda looked like the Beretta CX4). The price was right and it also came with two magazines, so I thought "What the heck." Anyway, got it home and tried to shoot it and it would only shoot one round and it would eject the shell and almost load another round, but wouldn't quite close the bolt, so it wouldn't fire.
I called Hi Point to see about the warranty status and spoke with a couple of very pleasant gentlemen. They explained that their current policy regarding ATI stocks is that they will still warranty their product, but you have to buy a new stock from them. Their tactical stock was $60 and their classic stock was $20. Since we already had another 995 with a tactical stock, I opted for the $20 classic stock. They asked that all I send to them was the barrelled action. Oh yeah, it also didn't have any iron sights on it because those interfered with the scope (I guess).
So it cost $11 to ship it to them and they had it for about 3 weeks. When it came back, according the checklist that was enclosed, it was about 80% new parts, had a new stock, new sights, a sling, tool kit, and TWO magazines. I think the magazines usually cost about $15 to $17, so for the $31 I was into it form ($11 shipping + $20 for the stock), I got a rebuilt carbine with accessories. And I thought the turnaround was very quick.
I've taken it shooting a few times since it's return and have had zero issues. I know that Hi-Points are cheap guns, but I really can't find too much fault in them. I can just about guarantee that I'll be purchasing additional units in .40 S&W and .45 acp when I get enough pennies rolled, if nothing else just because of the superior warranty and customer service. I think the only negative to the Hi Points is along the subject of the OP, and that is a lack of hi-cap magazines. I've only ever seen 10 and 15 round ones, and I've heard more bad than good about the 15 round units.
I like the looks of the Taurus carbine, but it's a little spendy for me right now, compared to the Hi Points (obviously). Anyway, sorry for dragging the thread off topic, just wanted to report on my good interaction with Hi Point.
Good luck and take care.