The Ultimag 30R is a 30-round 5.56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons, with transparent windows for rapid visual confirmation of remaining rounds.The Ultimag 30R is made to provide a strong, durable, and reliable magazine solution using high-grade materials.Advantages:Multi-textured gripping surface for secure grip when handling the magazineUnique floor plate for versatile coupling optionsDisassembled by hand, no tools neededLong-lasting stainless steel cataphoresis-coated spring for ideal corrosion protectionHybrid AK style spring design prevents tilt or bindingUnique internal design for smoother, more reliable feedingLow friction follower for increased reliabilityDurable, light weight, impact and crush resistant, reinforced polymer constructionLong-lasting spring design for extended loaded storage durationTranslucent round-count windows on both sides combined with an indicative follower for rapid visual identification of remaining rounds from 10 to 30Extended floorplate for improved magazine handling with gloves and gearCompatible with double and triple mag pouchesOver-travel protection, stops on the followerCompatibility:5.56x45 NATO and .223 Rem M16/M4/AR15 variants