I've received so many inconsistant answers to this question that I would not even want to say what I heard. I believe the confusion surrounds is that the Phantom HP comes with a mag extension kit.
Getting the manuf. sugg. price is also a challenge. I was pricing it in my area (St. Louis, MO) and called a distributer and they sell it to dealers in my area for about $270. The dealers seem to sell it for around $360, but I thought the sugg price was less than that ($330)? Gunfinder.net wants $348 + shipping.
Getting the company on the phone is no easy task if your dealer or you are trying to get information. Keep calling, I've made it through once, someone does work there.