I have no idea what, if anything he might be carrying. There was a time firearms were presented to presidents on special occasions, though I would guess they, along with other "gifts", were cataloged, and stored away.
I do remember reading that LBJ gave the Secret Service fits as he liked to carry and shoot guns when on his ranch.
Personal opinion is a good thing, and everyone is entitled to one. The hard part is separating informed opinion from someone who is just blowing hot air....