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Where are the fences on a shotgun?

Mike George
The term goes back to the old days of percussion cap muzzle loaders, on which there was sometimes a semi-circular steel fence behind the nipple on which the cap was placed.

The idea was that they would deflect any hot escaping gases, and bits of metal if a cap fragmented, away from the shooter?s face.

Today the term is usually only applied to side-by-sides, to describe the near-hemispherical faces which form the rear of the standing breech.

On quality guns they are often elaborately engraved.