Hmmm... what should one use for crocodile hunting in the sewers of Manhattan?

Given the ricochet dangers posed by engagements in concrete and brick tubes, I'm thinking something along the lines of a 21" Remington Model 11 /Browning Auto-5 in 12 gauge, with an extended magazine tube and shortened buttstock.

http://www.imfdb.org/images/thumb/c/c6/Lgwhippit.jpg/400px-Lgwhippit.jpg

from http://texashideout.tripod.com/guns.html