Probably because there are much lighter and more portable systems available today that fill the same role, just as effectively.
I have been thinking about this and I wonder how many people actually think they stand a chance of winning? Hit and run tactics and guerilla warfare are excellent force multipliers, but the fact of the matter is that most militaries are getting much better at defending against it. Looking at our own military, you'd have the increasing speed and profeciency of small and mobile special operations groups with tactics they've practiced and proven in combat. You have UAVs and other high flying airborne threats that you are unlikely to be able to defend against. Many of these can or are developing the technology to carry and deliver a formiddible weapon load accurately, but really, the cameras and infrared technology they possess is dangerous enough if you are trying to evade or escape. There are snipers that are going to simply outclass anything you can try and compete against them with, even with your shiney Barrett. Artillery and air support are getting more and more precise, so really, the sniper or UAV doesn't really even have to expose itself if they don't want to. All they have to do is call in the target coordinates and precision fire can rain down on you from no where, and there is absolutely nothing you can do to defend against it--esp if you have no artillery or air support. The best defense against this would be to stay in an urban setting where high explosive rounds pose too much of a threat of collateral damage. But this assumes the enemy cares about how many non-combatants it kills, we all know how good modern militaries are getting at urban combat, and that still leaves snipers that you really can't compete with. Then you have armored vehicles with no plausible offense or defense against them unless you can lure them next to a really, really big IED. In the meantime, again using our own military as an example, the main guns on the Bradley and Abrams are sub-MOA accurate with an effective range measured in the thousands of meters, and with infrared technology that makes it really hard to hide from them.
Then you got the issue of numbers. You're going to have a hard time finding competent people to fight with you. Yes, there are an estimated 65 million gun owners in the US, but not all of them are going to fight with you. In fact, most of them probably won't. Let's assume you get 6.5 million to fight in your cause. But this is spread over an entire continent. How many of them are local enough for you to reach and organize? If gun owners are like the rest of the American population, then more than half of them are overweight and a quarter of them are obese. You can't resist a modern fighting force if tubby can't make it up a stairwell carrying himself, let alone a weapon and gear. And lets face it, a lot of us, including myself for the moment, really have little or no training or experience in this kind of thing, and probably more ideas than sense. I'll have some training soon, but if you limit yourself to ex-military gun owners who are willing to resist a modern, well-equipped fighting force and are located close enough to you to be organized, all with what they have in their gun cabinets, you are going to have your work cut out for you. And this is very bad. Consider the kill ratio in Iraq right now. This enemy has been fighting this style of warfare since at least the 70s. They've had some practice, and currently have some damn good bomb builders. In 3 years they've managed to kill what, like 2944 of us, and inflict 20000 or so casualties in just under 1300 days. Does anyone have any official numbers on how many of them have been killed? Fighting this kind of technology, even if you have the desire, know how, and equipment, is man-power intensive and costs lives. If a modern military invades us, they are going to take over hospitals. If you show up with gunshot or shrapnel wounds, chances are you're going to be captured, not cured. So even if you have a doctor on your team, they still have to find adequate medical equipment and fascilities.
This whole thing strikes me as a mental masterbation exercise, if you will excuse the term. I think the best we can hope for if we all manage the testicular fortitude to resist, is to to inflict as much damage as possible before we disappear in a massive explosion we never saw coming, or take a bullet to the face from someone we never even knew existed.
Note to self: No more thinking/typing quickly when I should be doing something else. May say something stupid.
