Sounds like an air coupler to me.

- -
Rex Burkheimer
WM Automotive
Fort Worth TX

Jim Stewart wrote:
I'm working on a project and I need some form
of coaxial latch mechanism. I've seen something
with 3 steel balls and a cone and sleeve that
might work, but I don't know what it's proper
name is or where I can find a picture of it.

If it's any help, I think H&K builds a weapon
that latches the bolt with a similar mechanism.

Any help would be appreciated.