has anyone used the badger brakes and did you have to have a smith do the install, i would like to put one on my aac-sd but dont know of any local smiths i would trust to do it, most of them dont do any machine work.
You need a gunsmith for this, for two reasons:
Your barrel has to be either be straight/no taper at the "min" spec for the part you choose - or you need to have part of your barrel milled, as well as threaded.
You need to bore out the center
Clamp on makes it sound like its a simple install, in this case it only means you don't have to time the treading and its easier to remove.