BNK3R

The BNK3R is a large Hyperion craft, created to guard Angel. It is a fully-automated assault ship equipped with six turrets and a laser.

Handsome Jack refers to the BNK-3R as if it was a stationary placement right up until its encounter, where he reveals that it's actually an aircraft. The BNK3R drops several rare weapons such as the Bitch and several heads.

Critical hit spots
The critical hit spots are the cluster of eyes at the front and the swivel eye underneath.

If you are unable to hit these you can shoot the turrets off the BNK3R, there are four turrets: two on the top, and two on bottom (they spawn randomly).

Strategy
Once BNK3R is triggered, run back down the ramp to the ammo machine area, it will often fly over and around you. However, you will be protected from the majority of attacks due to the ramps above you. Focus on the turrets or the eyes but it will not fly around as much if you ignore the turrets, reducing the time it takes to destroy it.

With the friendly Buzzards flying around, the loaders should be busy upstairs but occasionally you will have one or two come down to visit (watch out for EXP loaders, since second wind targets are scarce).

B0re Exploit
Using the B0re ability of Zer0, it's possible to kill BNK3R in with 1 bullet if it hits the right spot. Run back down the ramp to the ammo machine area. From here shoot the underside rim of the ship. Alternatively run to the main platform and up the waterfall stairs, then aim just above the rim at the base of the turret on the side. Hitting a certain spot will trigger the B0re ability multiple times and instantly kill BNK3R.

Notable Drops

 * Bitch
 * The Sham
 * Unique heads for every class

Bugs

 * BNK3R may sometimes get stuck upon the top level of the complex, preventing it from being destroyed. Jumping onto it from a higher point may sometimes free the BNK3R, otherwise a restart is required.
 * The B0re exploit sometimes causes BNK3R to glitch and rendered unable to be interacted with.

Trivia

 * The number on BNK3R's intro graphic, 00101010, is binary for 42. The number 42 is "The Answer to the Ultimate Question of Life, the Universe, and Everything" in "The Hitchhiker's Guide to the Galaxy" franchise.
 * According to Inside the Vault: The Art & Design of Borderlands 2, sound designer Joshua Davidson provides BNK-3R's voice. "When you hear BNK-3R taunting you, it's really just me yelling about tea through heavy audio processing."