That's one of my Vee-Twins. That particular one was ordered with parts for both semiauto and pump:
I made every single piece shown, except the cup seal and ball detents.
Drilled 'Cocker body? Cover those holes with the Eye Patch
! Doc's Machine
. Fixing, fiddling and transmogrifying markers since 1998. The Whiteboard
. Vaguely paintball-related absurdity every Monday, Wednesday and Friday.