Dating antique dovetails
Anson Forend Release - A catch for securing the forend to the barrels of a break-open gun, operated, via a longitudinal rod, by a pushbutton exposed at the very tip of the forend. Anvil - A small metal block, inside a Boxer primer, against which the blow of the firing pin causes the priming compound to be pinched sharply---and thus detonated.
In the Berdan system, the anvil is built into the cartridge case's primer pocket.
If the balance point is ahead of the hingepin the gun would be said to be barrel-heavy with more forward inertia; slower to swing and slower to stop.Photo Anson & Deeley Action - A type of boxlock action design for a break-open gun, patented in 1875, the essence of simplicity utilizing only two springs and three moving parts (per barrel).