People complained that a M-1 Carbine is way under powered, yet it is 800 ft lbs. The 9mm is about 400! I had two of the Marlin Camp 9 Carbines, and found them woefully under powered on pest animals on the farm. If a 20 pound animal runs away what will a 180 pound thug do?
I know a number of farmers that use M-1 Carbines, but I know none that use any pistol caliber carbine (9mm, 40S&W or 45 ACP) there are some 357, 44 mag and a old 44-40 lever guns in service around Central Ohio.
I would thing in areas where larger predators abound, larger caliber rifles are the minimum.
I don't sell any of these guns, you should think about the unlikely but real world use! Other wise, you can run around playing Army with a Cap Gun or a 22 Long Rifle if ammo cost is a real concern.
Ivan