I've only thrown my $0.02 in once, not counting times where I have let someone know I liked a specific model they were checking out. Even than that is few and far between.
The one time however, was at the PX on Lejeune where they sell firearms. A lady was working behind the counter, and I was there just browsing through the cabinets when a guy started asking about stuff for home defense. He pointed out a lever action, and asked what it was. I forget the model, but it was in .45-70. When the lady said something along the lines of a pump action shotgun is more common for home defense, he said 'no way, .45 sounds awesome, Ill be able to shoot through walls with that.' She sort of insisted one the shotgun or one of the semi-auto pistols. Still, he wanted that "45 rifle." Since I was standing right next to him, and he kind of had the attitude that this lady didn't know a thing, I politely suggested a 12 guage is common and for good reason. I told him about the one I own, and briefly told him why a .45-70 lever rifle in a town like Jacksonville was not the most ideal. After that he started asking about the Mossbergs. I also suggested he look into some sort of training beyond the annual rifle qualification...
If it wasn't for the fact that it was on base, I don't know if I would of said anything. Sometimes you have to police your own though!
-Max.