It's not an investment. If you need them, get them. If you don't need them, don't buy them.
If.....and I think it is a very big if.....there is a ban on high capacity magazines it most certainly would be an investment because I guarantee you you could get way more than you paid for them and if you need them in the future you got them. I am not trying to add fuel to the buying panic, but lets be real.
Everybody that says people who are buying what they can now are going to feel pretty stupid if nothing happens are going to feel pretty stupid themselves for not buying if somthing does happen....
Some would rather have it and not need it than need it and not have it......make your own choice....