We need to get the message out to the larger sporting goods stores like Cabelas and Bass Pro, etc., to have friendlier "message apparel.... 
Would it be kewl if the sporting goods stores started marketing more non-core products to compete with bigoted, intolerant gun-hating people?
I am at least able to buy ammo at Wal-Mart....which, just to brag a bit, I picked up one of those (the last one)
200 round bulk packs of .223
for $46.20....eat ya'lls heart out!
I wear a Guns Digest tee, my boys wear various shirts with manufacturers names on them from time to time. I know Remington and Ruger have stores to buy shirts. In Jaybethel's theme, more radical shirts would tend to traumatize people so my "When All Else Fails Vote From The Rooftops" tee probably fits that vein. But to be a bit contrary to Jay, though I agree not to initially wear the more "brazen" examples, I would, after employees get to know one, a bit about their family and their character, not be afraid to whip out shirts that may intimidate those who don't know you. My belief is that once someone knows you the rhetoric can be ramped up a bit, relaxed and revisited to assimilate the uninitiated. Just my 2 cents.
Also...just for grins, I was able to buy 200 rds of .223 for $46.20! Eat ur harts out.