Nordic Components MXT Extension Package for Beretta 1301 Tactical/A300 Ultima, Includes 1301 Tactical-specific Barrel Clamp, QD Sling Plate and Tactical Rail for Clamp, and MXT +2 Magazine Extension, Increases Magazine Capacity to 7 Rounds with Flush-Fit Extension T, Only Compatible with Gen 1 and 2 1301 Models/ A300 Models with a 5 Round Factory Capacity MXT-BR1301TAC-PKG The Beretta 1301 extension increases magazine capacity to 7 rounds (capacity determined with 2 3/4" shells and may vary with shells of differing length). Barrel clamp kit includes 1301 Tactical-exclusive clamp" Picatinny rail" and QDA swivel attachment.