Checking out the gun magazines at the newsstand there seems to be a dedicated magazine for just about every type of handgun or longarm.
What I don't find is one primarily for the AR15.
Anybody know of such a publication?

 no magazine that i know of, but there are plenty of hardback & soft cover books on the AR-15/M16.....

here is one my dear wife sent for me for my Christmas gift: "The History and Development of the M16 Rifle and Its Cartridge.
  by    Hughes, David R.

it is out of print & a collectors edition & cost $115.00......, i have nearly every book ever written about/on the AR-15/M16, including all the military manuals..., i am truely an AR-15NUTT.......!!!!!!!!