The autopistol is the only large-mag weapon that has this ability AFAIK (Unless you count the boltpistol). It struck me that this makes it the only fully-automatic weapon that you can use while sprinting with marksman’s focus. You can also use it to build skirmisher stacks, which is pretty cool since you’ll likely be taking onslaught with it anyway as Veteran.
On Zealot, it seems to synergize with Blazing Piety and Inexorable judgement naturally. Not to mention swift certainty, and all of Zealot’s many dodge-related perks.
Psyker meanwhile can do some funky things with Empathic Evasion, Tranquility through Slaughter, and Scrier’s gaze.
Edit: The Autopistol can also use Inspiring Barrage, which can make up for veteran’s reliance on headshots and/or elite kills to generate toughness.