The FAB Defense Ultimag 30R is a 30-round 5.56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons, with transparent windows for rapid visual identification of remaining rounds. The Ultimag 30R provides a strong, durable, and reliable magazine solution using high grade materials. FeaturesMulti-textured surface for enhanced grip when handling and reloadingUnique floor plate for versatile coupling optionsDisassembled by hand, no tools neededLong-lasting cataphoresis-coated spring for ideal corrosion protectionHybrid AK style spring design prevents tiltUnique internal design for smoother, more reliable feedingLow-friction follower for increased reliabilityDurable, lightweight, impact and crush-resistant reinforced polymer bodyLong-lasting spring design for extended duration in loaded storageRound-level windows and indicators on both sides indicates from 10 to 30Extended floorplate for improved magazine handling with gloves and gearCompatible with double and triple ...