For me, there were a couple of reasons I chose a pistol over an SBR. The first is that the pistol is not an NFA item. I can transport it freely and I could shoot it the day I bought it (in theory. No ranges were open then). Another reason is that I have a concealed pistol license and can, therefore, keep it concealed with ammunition in it. Also, I could replace the barrel with a longer one or even a full-length upper. However, I could not legally put a shorter barrel on a weapon that I purchased as a rifle unless I filed it as an SBR.How is it better though than a short barreled suitable caliber carbine? What advantages does it have over it?