$35
(As is)
(Buyer pays shipping)
I don't know much about this; it was given to me by another machinist.
Here is what I know:
The back is cocker threaded, it's bored all the way and end is machined and threaded for the tips.
The two shorter tips are threaded and have an oring groove and fit the back, but have a 5/8" bore (needs to be finished)
The long tip was started but not finished, needs oring groove and threaded end cut to correct length to fit the back, bore is also 5/8" and needs finished.
Also, no finish milling has been done to the exterior, that too needs finished.
It looks like the intent was to make a 12, 14 and 18 inch barrel system.