I've been thinking about your need to take out an unspecified number of people and have come up with a gunless solution. I was inspired by Roald Dahl's classic short story 'Lamb to the Slaughter' where the protagonist beats his victim to death with a frozen leg of lamb. By the time the police get their act together, it's already defrosted and they overlook it as a potential murder weapon. With the recent craze for ice-docking, who doesn't keep a couple of frozen tollies handy in the works freezer? Simply bludgeon your victims to death then flush the jobbies down the toilet. You might need a couple of kettlesworth of boiling water to get them round the U-bend.
Have you ever looked at the giant Richard in the pan and thought "how on earth did I manage to push that leviathan out?" Imagine then, that is how much length and width of cock you could take up the arse. Just saying, next time you are in Ann Summers check out the dildos/vibes/strap-ons and revise what you thought of as "too big".
