Description: Beretta 303/390/391/A300 Ejector Spring, 12/20 GA. Coiled from steel, this spring is manufactured by Beretta for use in 303, 390, 391, 3901, A300 Outlander and A300 Ultima Beretta shotgun models chambered in either 12 or 20 gauge. The spring applies pressure to the shotgun's ejector for proper movement and power to expel spent shells. Keep your favorite Beretta shotgun running like new with quality factory-original parts straight from Beretta.