Not being an expert on these matters, if an unfriendly court came to be - might they use the precedent of reasonable restrictions to support the bans on types of guns? Say that Biden's shotgun and perhaps a SW Model 10 is the law of the land, so to speak.
That video by progun scholar Joyce Malcom would argue otherwise.
http://www.pbs.org/newshour/rundown/...t-scholar.html
The common usage of semi handguns and purchase of so many AR types argue for common usage. But
reasonable might be said to correct for the aberrations of these guns being in circulation. Perhaps not comparable, but the common usage of alcohol and marijuana have led to bans and usage in various versions.
Granted those aren't in the Constitution now but I can see a Kagan, Sotomayor court, etc. not buying that argument of common usage as those semis and EBRS are not reasonable, even if common.