Hmm...time to put our curiously two billed Sherlock Holmes hats on. Let's look at the clues...the mystery person is likely an NRA member, is affiliated with ARFcom, is an American (or wants us to believe they are) and has an affinity for window stickers.
We can only surmise, given the evidence at hand, that our mystery person is an unusually small with childlike features and extremely short T-rex type arms. The unsub (unidentified subject for y'all that aren't Joe Montegna fans) is a vegan but sneaks fried sammiches when nobody is looking. The unsub has a fascination with firearms and was likely turned down by military or law enforcement due to its squatty T-rex arms and resents authority. The unsub is most likely impotent and addicted to Viagra. The unsub's favorite color is purple and has a disturbing and deviant relationship with a moldy Barney plushie toy. The unsub may have firearms on his person but struggles to actually operate them so is considered short armed and slightly dangerous due to his ability to bite your kneecaps. Finally, after all profile information has been reviewed we believe the unsub to most likely be a gnome or hobbit, only direct examination of the body for hairy feet and gnome hats will determine for sure.