ok, is that for a barrel that already has the groove in it?
does a new barrel come with a groove? if not how do you get that in there?
can you do it with a bench top drill press?
how do you know with an semi auto weapon if the bolt is locked or not?
If the barrel already has a barrel pin hole you will most likely have to use an oversized pin. If it's a new barrel without the pin groove you will be able to use a standard pin.
When putting the pin groove in the barrel you should use a reamer, first drill with an under sized bit then finish with the reamer.
If you hav an assembled AK, if not you have to look at the bolt and find this. Look in the mag well with the bolt closed and you will see a line on the bolt that goes from front to back, this line should be down and either centered or close to it.