[Bernard Marx]

does not hold more rounds than any other magazine fed rifle

I fully support 2nd Amendment rights. But playing Devil's Advocate for a moment, critics will seize on the perp's 100-round magazine for the AR to support their gun-grab argument. I own a shotgun and several rifles but have been away from active shooting sports for some years. Are magazines of that capacity available for magazine-fed semi-auto sporting rifles? I simply don't know but rather doubt it.

[smokingfrog]

100 round "drum magazines" are available, but they're expensive, often not very reliable, and hanging all that extra weight from your rifle is going to make it less maneuverable. In this case, it's probably a good thing the shooter used one.

[Iron Munro]

I fully support 2nd Amendment rights. But playing Devil's Advocate for a moment, critics will seize on the perp's 100-round magazine for the AR to support their gun-grab argument

A Marksman doesn't need a 100 round spray and pray magazine.

But there is no reason a citizen shouldn't be able to buy one.

Remember: "shall not be infringed".