yes, the mag holds 14 rds, and also can hold a 12g, or have a refillable co2 mini-tank, or run constant air from a remote source. The mags can use First strike OR standard paint, but only one at a time.
The barrel changeover is performed by pulling a 'AR cocking lever' or hitting a release button. this switches the barrel from hopperfeed to magfeed (or back). basically run a hopper of regular paint, switch for a few 'reach out and touch someone' shots, and then back to hopperfeed.
an apex is doable for the regular paint, but would destroy a fs round. the apex puts the backspin on a ball by having a soft rubber 'tounge' that brushes one side of the ball, making that side drag, and the ball spin accordingly. I have a apex tip for my tib9, and no longer use it (it seemed to break 1/10 rounds, but I did get a great 'bomb shot' elimination once)