IRK Battle Royale - Fight with IRK items.

OnionSoup thought this was worth mentioning said
5

Scenario:
The bombs have dropped. We are living in a nuclear winter. Food is scarce. The good news is, Meh has plenty of boxes of cereal and they’re willing to give one lucky winner of a mass brawl a lifetime supply. It’s fight time… You must fight for your cereal…

The catch. You are allowed one weapon, but that weapon has to be selected from your most recent Instant Regret Kit. Which item do you take, and how do you rate your odds of winning with that item?