I'm usually the one with the Tac-19 on hardcore doing the shredding...lol. The thing is Rage you have to know how to use it in order to learn how to defend against it. You won't catch me using it on larger maps like Instinct because it severely limits how effectively you can play. If you want to defend against a shotgun get them out in the open were your SMG, Assault rifle, etc. can stand a chance.
Have them play your game not the other way around.
Yes believe it or not I get hitmarkers in hardcore sometime.