If you get a back bottle Phantom, the tank will come down at about a 10* angle (total estimation on that one) If you get a butt stock for your tank, it should rest right on your shoulder while making the gun still feel very natural.
Both types of grips come with the same length of barrel, but I honestly dont reccomend the 14inch barrel. It is rather long, and kinda takes away from the compact design of the Phantom. I use 14inch barrels on my semis, but just cant do it with my Phantom.
CCI-OT...we miss you