You can buy a couple of other upgrades for the TiPX. Mislig is coming out with the MRX upgrade, turns it into a rifle. This has not dropped yet, though. A similiar upgrade is available from Eric Engler "The Sarge kit." You can buy a FS upgrade. You can get extended 20-round Zeta mags. You can also get a longer barrel (X7 threading).
Those who think they know everything annoy those who do.