If you don't have an AR and you are legally able to get one, I totally would. If I was certain there wasn't going to be a ban yet, I would definitely wait until the panic buying dies down and prices stabilize. It's been absolutely crazy, I have seen PMAG's going for $50. They normally go for like $12 each. Prior to the election I stocked up on them. Could be an amazing payoff, but they are not for sale . AR15's, AK's, FAL's... everything that looks "scary" has been flying off the shelves and has gone up in price, even a lot of Fudd guns. Ammo has gone up in price too.
I'd say the likelihood of a Federal Ban is not as likely at the present time as many people think, however I hope that more people keep fighting for their 2A rights with vigorous passion and instill the Fear of God into the politicians who are on the fence about new restrictions and there will certainly be many battles for the 2nd amendment in the near future.
The likelihood for more restrictions in liberal bastions like CT is probable though. Sorry =/
I wouldn't buy one as an investment though, unless you mean a defense investment or a "Crap hits the fan" investment. In my opinion it would be like buying at the peak right now, although if a ban actually does take effect, there is no saying what the prices would go. After the Hughes amendment Unconstitutionally banned the manufacture of fully automatic firearms in 1986, the prices of full auto guns have gone through the roof. $10k+ for a transferable, pre-1986 M16. From what I heard, there are about 183,000 transferable machine guns, and I'm not sure if that includes things like transferable, fully automatic sears and lower receivers that can be used to legally convert a semi-auto to a machine gun.
AR15's are one of the most popular rifles in America now, partially thanks to the politicians that constantly threaten to ignore the Constitution and restrict them. In 2009 1 out of every 4 firearms manufactured in America was an ar15 type rifle.
Also, from what I have heard, it seems like CT is probably going to tighten its already strict gun laws. I have no doubt that if they ban "scary" guns you will still be able to own Fudd guns, but once the precedent has been set, there is no telling how soon it will be before they start banning other classes of firearms.
If you have the money to burn, go ahead and get one, but IMO, I wouldn't buy one as an investment because cashing out on that investment could entail federal prison if Swinestein and the other fools get their restrictions passed.