Well, perhaps he should be reminded that the BoR doesn't "grant" anything; it merely enumerates pre-existing, natural rights.
As with religion, speech & assembly (1A), we have the right to self-defense, whether the threat comes from criminals, insurrection, enemies or tyrannical government, regardless of any written words.
The greatest irony, which seems to be missed by most, is that the 2A practically guaranteed its own affirmation. Even though it was 5-4, I believe a dissenting justice would have joined the majority if Kennedy had wavered. No one wants to play that level of brinkmanship to see if the People would really be pushed to CWII.
Not to beat a dead horse here, but Reinhard understands that. He's on our side — 100% His attack is against people who don't understand that, such as E. J. Dionne. Reinhard even calls Scalia's defence of the literal interpretation of the 2nd Amendment "majestic."
To sum up, Reinhard, good; Dionne, bad.
FWIW, Scalia emphasized that in his decision--that it is an a priori right, not granted by anyone but God.