G'Day Fella's,

Interesting and thanks for sharing Ripp.

Kind of a variation on the Grand Power pistol (I'll go find a link shortly).

FYI, here is how these rotating barrel lock up type pistols function and work.
http://www.thefirearmblog.com/blog/2015/11/18/review-grand-power-k100-mk12/
and
https://www.youtube.com/watch?v=4Pu0Kj5Vpvk

Doh!
Homer