Railguns and directed energy weapons will be de riguer, as our tech base of knowledge doubles every 8 months or so. We'll have the power source figured out by then. Civilian ownership depends on us, but if trends continue, the US and some other countries may have almost unregulated ownership while a UN dominated world attempts to cut us off from the rest of the world. But the pendulum is swinging back the other way for personal firearms ownership in the US. Africa may collapse entirely, and be the worlds only producer and user of the venerable AK pattern. We'll have combat matches of classic pistols of the 21st century, such as Glock and 1911, and I can hope my beloved CZs, but it will be a hobbyist thing.