You do get a regular buffer tube. Most guys like heavier weight buffers, also helps to have a longer buffer because the 9mm is shorter so the bolt doesnt need to travel as far.
I used the lwrc ultra compact stock and made my own buffer. Its not as heavy as the specific 9mm buffer i had before, but i made it the exact length i needed and added all the tungsten that would fit.
So just a stock and a possibly a heavier buffer as I can use the pistol buffer tube?