Parker (DC case) response brief online
The DC government's brief in Parker (challenging DC gun ban and other restrictions) is online in pdf form here.
Hat top to reader Jim Archer, who observes that it lists states that supposedly did not guarantee an individual right to arms (p.29, pdf pg. 40) as including Rhode Island. That's an interesting way of putting it -- RI had *no* constitution until 1842, he notes.
I've skimmed the brief, and it strikes me that they're advocating Saul Cornell's "civic individual right" instead of the earlier "collective right" approach.