ProMag manufactures effective aftermarket magazines for various popular firearms.This 21-round mag is compatible with Sig P320 9mm pistols. With a body constructed of heat-treated steel you can expect optimum durability and longevity.ProMag Sig Sauer P320 9mm Magazine21 Round CapacitySteel ConstructionFlat Dark Earth FinishCompatible With Sig Sauer P320 9mm PistolsIn addition this magazine has an injection-molded follower and a spring formed from heat-treated chrome silicone wire.Whether you're looking for an effective aftermarket replacement mag or just a spare one to have some extra rounds on standby this product is a great choice.Order your ProMag Sig Sauer P320 9mm magazine online today!Score big savings and fast shipping when you shop our large selection of 9mm ammo in bulk available online at Ammunition Depot.Looking for new range gear? Find great deals on all in-stock shooting safety gear available now from the brands you know and trust!