Research what happened in Canada when they tried to register the guns, all guns. The media never talks about it, and the NRA doesn't even mention it, but research it and realize the dates and time frames from start to finish. Over ten years or so they only got lists on about 5% or so of the estimated weapons, spent about a billion dollars (literally) tryiing it, and then it was repealed by a more conservative gov't elected in over time.
Basically, what guns? Right now, they don't know here most of the guns are - period. They only know if we tell them. Thru 4473's, they can fairly safely assume most people on a 4473 have more than one, but if we all traded guns (i.e. drop the emotion on the inanimate objects we own, and trade even up for another, which is legal right now, except for handguns), it will immensely compound gun-tracing. Then build underground ranges to quiet the practice (ie training), and components can be made with some work, so there you go.....theoretically. In fact, build them now. And stock up as opportunity rears it's head.
Realistically, losing face with family, customers, neighbors, etc. would take it's attrition on honest people. And they would use coercion, lies, accusations, all perpetuated by a willing media.
Not to make it sound like it isn't a realistic possibility - it is VERY real! But we are the most independent people on the face of the Earth when it comes to our gov't, and we will persevere, albiet by bleeding and dying perhaps.
I keep track of those that I have bought locally with no paperwork (legal for longguns face to face here), and those that I have purchased thru a FFL w/ paperwork, and am working to minimize the ones with paperwork. Those they can have if they show that I didn't sell them last year, and they can find them. They would most likely start by arresting those least likely to resist first for examples. With no wife and kids, being the martyr isn't such a bleak possibility - others will bend much easier.
Right now, I'm not too worried about my opinion broadcast on the net, and 80 million or so gun owners is a [beeep] of a lot to track down. Only over time, and with taking rights away one by one, can they hope to succeed. Newer generations are more likely to be more controlled. And be forever vigilant in your opinion w/ friends, neighbors, fellow gun owners on belonging to and supporting NRA, GOA, etc. and never letting it get too far in the first place. [beeep], we have all kinds of studies showing, for real, that more guns in lawful owners' hands actually reduces crime. So why are we hiding?!?!?!?
I know I sound like a militia nut, but it MAY come to this if we don't just continue to fight at the polls, on forums like this, etc. Here we are preaching to the choir, but we need to take that message to all of the rest of the lawful citizen's of the country, and the world for that matter, and make them understand what has happened elsewhere, and could happen here, and why it shouldn't. This ever-growing entitlement state may be our big downfall and needs addressed about a decade ago! Populating this country with those unwilling to do for themselves,, has shown thru history to lead to major civil unrest! Rant off.