I've completely stripped mine already... not for the faint of heart.
1. Remove the bolt & recoil spring from the stock (comes out the rear).
2. Loosen the tube nut
3a). Remove C-Clip from safety
3b). Remove all screws from both sides (have digital camera ready to go)
4. Pry apart the plastic halves until the ejection port side finally comes off (it will feel like you are breaking it)
5. Take pics of spring locations
6. Barrel comes out when one half is removed.
7. Tube comes out last after all the internal crap is removed.
It was after taking it apart and putting it back together that I truly appreciated the rip-off that has occurred. LOL!
I really wish Kel-Tec sent the Sub9 to Canada - That is what we should have got for the price. Seriously!! The Sub9 looks awesome!!! Discontinued in the USA because it sold for $700'ish... Hmmmmmmmmmmmmmmmmmmmmmm We were all sold unserviceable, disposable guns for the price of a nice handgun.

God I feel ripped.
I'll officially stop my moaning now... sorry all.

Happy Sunshine Summer Day~ fallalalala