Overkill in TB maybe, but in RT it's doomed vs. most other builds: strong in one mode, weak in another. I admit that 1 AP/shot is a little too much in any mode though. Still, "If it looks stupid but it works, it ain't stupid."
What I'll never accept is that it's supposed to work like this, no matter who says so. As long as I draw breath, I'll consider BRoA not enabling 2H guns' single shot for 2 AP a bug. And I'll mourn the loss of my precious Living anatomy damage bonus the whole time.