Overview Reviews Product Description Federation Firearms adapter for 12ga single shot shotgun. Adapts 12ga 3″ to shoot .410 3″ Product Videos Custom Field Product Reviews Write a Review Write a Review × Federation Firearms Federation Adapter Insert for 12 Ga Single Shot Shotgun, 12 Ga 3" to Shoot 410 3" Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *