This is an original factory replacement part. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts. Disassembly and assembly may be required and some parts may require installation by a qualified gunsmith. This factory choke tube from Beretta will only fit the A391 Xtrema 3.5, AL391 Urika, and Al391 Teknys 12 gauge shotguns.