I wouldnt. Maybe it is possible it COULD be done without a vice in a pinch during the zombie apocalypse or some crap, but it's a bad idea. Spend $12.00 on a vice block and then ask someone to let you borrow their vice, otherwise you stand a very high likely hood of something slipping around and you running a dremel all up on your receiver. Just trust me. I have F'd up more expensive parts then I care to admit because I was trying to be cheap or impatient (or both, most the time). You will come out way ahead to spend a few more dollars and wait a few more days then and it be done right then to do it now anyway and jack something up. Better yet, buy a vice too. You'll be using it over and over for the rest of your life, so it's not an expense so much as an investment, lol.