I tend to agree the shop is worried about liability. But let's be real here. Most can manufacturers will fix a baffle strike under warranty as long as you didn't do something really stupid like try and make a 5.56 can a 30 cal can with a hand drill (this was a real situation one of the can companies I dealt with told me about. I about fell out of my chair laughing.) I guess the headache they are trying to avoid is having to send the can back for warranty and now being in the middle of it? But still. It makes me wonder if they would feel differently if you had bought the can from them? Because at that point refusing to do so would be bad customer service IMHO.