Are not all triggers mechanical? What is a non mechanical trigger? Electrical?
There's mechanical triggers and inertia triggers.
Ok. I would consider interial triggers mechanical also, but I understand the contrast.
Most shotgunners that know anything about triggers consider there to be a considerable difference.
...anyone who has had the 2nd barrel fail because the inertial trigger didn't work properly can tell share why.
My daughter's 20 gauge Superposed Lighting often fails to fire the 2nd barrel because she doesn't have enough mass to make it kick over.