Savage Four - Tenner Adapts your 12Ga, 16, or 20 GA to fire 410 shells
This is the steel shotgun gauge adapter for 12ga will convert your single barrel shotgun to 410 it was made by Savage Arms Co Westfield Mass.
Featherweight Model only weighs 5oz
No Alteration to gun needed
Fits all standard single or double barrel shotguns
Easily inserted and removed in seconds without tools.