Drum magazines are notorious for being unreliable. Their only real purpose is as a range toy. Anyone who knows anything about them would never use one in a real life "operation" (for lack of a better word). Take even the venerable Thompson, the old Chicago Piano. It was issued to certain troops in WW2 (and even as recently as Vietnam, if memory serves me). They rarely used the drum magazines, preferring the reliability of stick magazines. So tell me again how banning a 100 round drum magazine will help anything?
'Merica: Back to back World War Champs