This 50-round drum magazine from ProMag is compatible with Sig Sauer P365 9mm pistols.The drum housing is constructed of a proprietary DuPont Zytel-based polymer while the upper tower has a full-length steel internal insert stamped and welded like the factory magazine.The magazine's spring is formed from heat-treated stainless steel wire and has an injection-molded magazine follower.ProMag Sig P365 9mm Drum Magazine50 Round CapacityFits Sig Sauer Sig P365 9mm PistolsOrder your ProMag Sig P365 9mm magazine online today!Searching for 9mm? Score big savings when you shop our large selection of cheap 9mm ammo for sale.Need new range accessories? Save big when you shop our online selection of Firearm Cleaning Supplies.