The Answer of Phantom and Arrow Platter

Well, that makes things more situational now. >_>

So does that mean Arrow Blaster's Turret Mode switches rapidly through the Quiver Cartridge arrows unless you use Advanced Quiver to make it stop on one of Drain/Poison/Magic?

Whoops, I just checked today by leaving Arrow Platter's turret on and not using any of my skills and I didn't see any procs of Armor Piercing/Quiver Cartridge. I guess I was just being a huge derp when I thought that xP

Ok I was right the first time I spoke LOL. Arrow Platter's turret does indeed activate Armor Piercing and Quiver Cartridge! However, it's sort of weird. In terms of Armor Piercing, it uses the current success rate based on the attacks YOU do, the turret does not stack it. And I feel like it only activates it once per summon but idk. And for Quiver Cartridge, it uses whatever arrowheads you're on atm but it does not 'consume' them. Also, it doesn't activate the FA arrows, only poison or drain. So yeah, if you lock in Drain with Advanced Quiver Cartridge and you have Arrow Platter summoned, you'll always be at full health (except when the boss DRs lol).

Tl;dr: Arrow Platter's summon uses your current 'properties' but doesn't 'stack' them, if you know what I mean. I haven't tried testing with Concentration but I guess it would work the same way.