I support reasonable gun control, including registering non-long guns.
Therein lies the crux of the problem. How many times must it be proven that registration is a prelude to confiscation? Nazi Germany, England, etc. When you registered yours, the government immediately seized one and will seize the others when you pass away.
What is unreasonable gun control one day may become reasonable the next. You can make a reasonable and rational, albeit wrong, argument to ban guns entirely.