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 magazine Unique floor plate for versatile coupling options Disassembled by hand, no tools needed Long-lasting stainless steel cataphoresis-coated spring for ideal corrosion protection Hybrid AK style spring design prevents tilt or binding Unique internal design for smoother, more reliable feeding Low friction follower for increased reliability Durable, light weight, impact and crush resistant, reinforced polymer construction Long-lasting spring design for extended loaded storage duration Translucent round-count windows on both sides combined with an indicative follower for rapid visual identification of remaining rounds from 10 to 30 Extended floorplate for improved magazine handling with gloves and gear Compatible with double and triple mag pouches Over-travel protection, stops on the follower Compatibility: 5.56x45 NATO and .223 Rem M16/M4/AR15 variants