I'm only concerned about when it's seen on the way to/from the car. At home, the only eyeballs are my family and one neighbor who thinks the way I do.
I was surprised that the standard Manfrotto bag would be big enough diameter for the AR. If I had an optic on them, no dice. Right now they have flip up irons. I'm going to end up with some kind of optic on a qd mount. If I need to "use" them it's going to be under 100yds and I can hit minute of salad plate every time with irons.
A long time ago I realized having a shitload of crap in the back of the car makes great stealth for carrying (insert whatever here). Complete with empty pop bottles, old towels, magazines. It's just a messy old car. That reminds me, I need to swap out the winter crap for the spring/summer/fall crap.
No one except me knows what's back there...