A-5 Stealth Retail or Aftermarket

I am considering buying the A-5 Stealth (Flatline) and read that the retail version does not have threads to put on other barrels so you need to thread it yourself if you want to add another barrel.  Some posts have said that it is better to buy the regular A-5 and add the Flatline.

My question is this:

Does the Flatline work better on the retail version as compared to the aftermarket or do you get the same performance from both? 

Why would Tippmann make the A-5 Stealth without threads if it did not impact the performance (or are they saving a few cents by not threading it)?

Thx in advance.

Fido

There is no difference between a A5 stealth and an A5 with a Flatline and stock. The only differcnce is if you were to build the A5 Stealth you would have an A5 barrel adapter and a buttplate sitting around collecting dust. You probably could buy those parts off of www.tippmannparts.com if you want to put a different barrel/ take off the stock