Save $11.00 – This base allows the installation of a scope to your AL319/A391 shotgun. Weaver interface. Matt black finish. Beretta Scope Base for Semiauto Shotguns – Black The Beretta A400 Xtreme/A391 Xtrema Scope… Was: $90.00. Price: $79.00 (Price correct on 2022-06-07)