I am trying to decide on either the Marlin 9mm Camp Carbine or the Hi Point 9mm Carbine. This will not be my MBR, I am simply looking for a good mid range gun with very cheap ammo that I can also use in my pistolas. Any opinions? Also, what is the smallest cal rifle anyone would suggest I use for an MBR? I want something with the cheapest ammo possible but still have decent knock down power that can reach out there. Thanks.