The only issue I'm not aware of is whether they can use 10 round mags. I don't know if the carbine mags are proprietary (in which case they would be limited to 5 rounds) or if the Hi-Point handgun mags fit them in which case 10 rounders would be OK similar to the JR Carbine & others using Glock pistol mags. Maybe someone more familiar with Hi-Points can chime in.
I believe that they can use a modified 1911 mag.[/QUOTE]
Yes they can..I can't beleive I'm admitting this but I had a Hi Point pistol once. Haha!