First, if you match your handgun and carbine’s requirements, you need only one set of magazines. Pistol caliber carbines are less expensive to shoot, as the ammo is typically priced much lower than rifle ammo. Recoil and muzzle blast are low, compared to rifle calibers. This makes them a great choice for a new or younger shooter. Of course, these traits make them easy to shoot, and a good choice for home defense as well. Low recoil means faster follow-up shots, and low blast makes them a better choice for home protection when you may be forced to fire inside a dwelling, where the blast will cause permanent hearing loss.