I've read much of Saul Cornell & consider him an expert on proper interpretation of 2ndA. Needless to say, he's despised by the gun lobby & nra etc..
I sent him an essay I did once on certain historical portions of the heller amendment, basically how scalia had perverted some historical figures and perverted what they said about 2ndA - like jos story, wm rawle, st george tucker, & ben oliver. As well as remarks from a british consortium of historians who noted that scalia had misinterpreted the English 'have arms' decree of 1689 - that it was not an individual rkba, but pertained to militia.