This woulda been your next clue if we'd needed one.

But OFS and Mongo took care of it.

Interesting method of fuzing, eh? Right before you hang and drop the round, you pulled the ring, inserted the round, and let it go - the lever flipped free as it cleared the tube, and off it went.

The Stokes mortar is essentially the first modern mortar. I could write a learned treatise here, but heck, real weapons geek Bruce Canfield has already done so - if you'd like to know more about the Stokes - simply click here.