Well it's not so clear to some. I can't tell you how many times I've had to clear up the misconception that I can't just order a firearm online and have it delivered to my door (except for C&R firearm purchases) or go to a vendor at a gun show and pickup a gun without a background check.
Well you can, if you go the right route. But I get your point. People on the gun-control side do tend to over exaggerate certain things like purchasing. Thats not to say the system isnt royally fucked to begin with.
My first gun was purchased through the regular pathways but my friend, who came with me, ended up buying a gun for his girlfriend at the same gun show from one of the vendors friends wife(I can't remember the exact connection) and they did it cash in hand and private to private with no background check.
The Iron Pipeline incorporates a lot of this to funnel guns to places like DC, New York and LA. So it is true it is not just some Amazon process but it is also very poorly regulated and the infrastructure to track crimes after the fact is abysmal which provides these large openings for gun traffickers.