I suggest you take a look here
and consider the following
60 round and 100 round magazine
compatible with M4/M16/AR15 type weapons
they promote by showing someone in military garb
but as far as I know such large capacity magazines are neither standard issue military equipment nor in fact encouraged in the armed forces, although perhaps someone with military experience than mine in the mid 60's might care to comment.
Please tell what legitimate purpose such a large capacity magazine has in civilian hands?
For weapons with a muzzle velocity of 3000 feet per second
whose bullets are designed to smash and maim human beings
Just so you know what we are up against