 The combination of firing from the shoulder, longer sight-radius, 3 points of contact (firing hand, support hand & shoulder), and precision offer a significantly more user-friendly platform.Carbines like the Kel-Tec SUB-2000, Hi Point 995TS and Beretta Cx4 Storm have the ability to mount user friendly optics, lights and lasers thanks to them having accessory rails, which make target acquisition and engagement much easier.The longer barrel can offer increased velocity and, with it, greater energy and effective range due to the propellant having more time to burn.