ya, I'm starting to think that no guns are a good idea, everyone wants guns, becuase you want to kill them, not really use any type of traps for it
But I do think you should make some sort of ranged weapon, like a flare-launcher, it woudn't do much damage, but you can spray something flamable(Maybe a gas-can, or something) onto the monster, and then shoot a flare at it and get it on fire, don't know how hard that would be to make the flames on it though
Sometimes, if you look carefully at a wall for a few minutes, you'll realize you wasted some time.  It's true.