New Glenn Reynolds piece on the 2A
"Second Amendment Penumbras: Some Preliminary Observations." He suggests that the core right to keep a gun for self protection carries with it penumbral rights to buy it, and ammunition for it, and to practice with it to prepare for such use. I just downloaded a copy, will read it later. SSRN rates articles by how many downloads they have, so downloads tend to make an article more prominent to other academics.