First off, where's the best place for me to getum? I can go through just about any commercial vendor through work. I was looking at McMaster Carr and they have a great selection, but I dont know what kind to get. Which leads to my next question.

My primary purpose right now is cutting retaining pin notches in rifle barrels. I will be using the pressed on pieces as a guide and a vise in my drill press. I will just be going straight down so the durability of the drill press arbor isnt an issue. What type of end mill would be best for this job? I will need one itty bitty one around 1mm and one around 7mm. Thanks