A broach can be used to finish the cut, like Mr, Gera is doing on the male section of "the circle" on this action....

http://forums.nitroexpress.com/showflat....e=0&fpart=2

But in my shop I would use a keyway cutter to get most of it out.

By the way, I hate fixed pins.


Firearms imports, consignments


[Linked Image from i.imgur.com]