The traditional battle lines have been drawn after another mass shooting, this one the worst in U.S. history.Democrats are calling for more gun control, possibly a ban on assault-style weapons that have been used to slaughter first-graders at Sandy Hook and nightclub patrons in Orlando.Republicans are calling for everyone to walk around with a loaded gun as the best measure to prevent gun violence. If only there were more guns on the streets, there would be less gun violence, they reason.Two weeks from now, absolutely nothing will be done and this conversation will quietly fade until the next mass shooting. Then the process will be repeated.But there are always new twists which emerge in this battle over bullets as we inch closer to being "the land of the shootout."