Spitfire - That is my method, and if you hit it just right, you get the stunned prey and not a dead prey (which sometimes takes more than one whack). I know, I expect alot of "OH that's cruel!", but I can't afford CO2, especially for the number of mice/rats I have, and any other method is also not feasible for my situation. I've gotten quite good over the years ( a cement block is perfect) and death is almost immediate about 95% of the time. Ask our prison system if they can make the same claim.