So in NGE and Rebuild Misato carries and uses a Heckler & Koch USP. Everyone uses a different gun but that's her choice of weaponry.
In the Next Time Preview for 3.0, death bait Kaji isn't wielding his own gun, he's holding Misato's gun, a Heckler & Koch USP.
You can read more about the Heckler & Koch USP: http://www.imfdb.org/wiki/Rebuild_of_Evangelion and http://www.imfdb.org/wiki/Neon_Genesis_Evangelion
So this is quite interesting and may shed some light on why Kaji is so crazy. Maybe he's trying to protect a incapacitated Misato from the people who captured Nerv with her gun? I can't think of any other reason that he'd have her gun. Sure rules out the possibility that he is shooting at Misato. Just some thoughts.