Uh, don't mean to start a debate but it was an AR-15/M-16 (not an AK 47) Also he apparently had a shotgun and a handgun (not yet identified so we don't even know if it used magazines - it could have been a revolver.) There is nothing conclusive about the ownership of the AR-15/M-16 he used. There is speculation he may have shot a guard and taken his weapon (the AR-15/M-16). DC is a 'gun free' zone with some of the toughest gun laws in the nation. So if they have the some of the toughest laws why weren't they working - especially on a Military Base? That also brings up another question - why was the security so lax and complacent? It appears there was no response by base security. Also there is the issues of his security clearance. If he was 'crazy' Why did he have a clearance at all with TWO (2) previous firearms charges - and possibly other issues? I am afraid the 'antis' cannot AT ALL point to guns on this one considering the extenuating circumstances, IE on a Military Base, lax security and his security clearance he should have possibly NOT had. This is was not a school or a theater. One final point. One of my handguns utilizes 16 round magazines. I have proven to many people how fast I can swap mags, almost not even skipping a beat so this whole 'magazine capacity' issue is really a non-issue. Even the Colt M1911 .45 (the cornerstone of all semi-automatic handguns) can have it's 8 round mags swapped just as quickly. Please try to understand the reality of this and see if you can consider the bigger picture and NOT just focus on the guns here.