Mesa Tactical SureShell Carrier and Rail for Beretta 1301 Tactical (6-Shell, 12-GA, 3 &frac14; in) The Picatinny rails are machined from aircraft grade 6061-T6 aluminum, which are mil-spec hard anodized and provide an extremely durable non-glare matte finish Holds 6-Shell, 12-GA Rail Length: 3 "