UTG RBT-DM25: UTG has designed this fantastic polymer magazine that is guaranteed to function flawlessly in any environment. UTG is known for its quality products, and this 25 round magazine is no exception. This magazine has endured extensive testing from the manufacturer from extreme temperatures, dropping, crushing, and more. This windowed magazine from UTG is one of the best out there. a Durable and Impact Resistant Glass Fiber Reinforced Matte Black Polymer Construction a Four-way Anti-tilt High Visibility Blue Follower and High Longevity Stainless Steel Spring for Reliable Feeding a Features Positive Grip Texturing, Left and Right Side Windowed Main Body with Remaining Round Count Indicators, Over-insertion Stop, and Removable Flared Floor Plate a Not Compatible with AR-10B, SCAR 17S, LAR8, HK417, or Rifles that Use M14, FAL, or HK G3/91 Patterned Magazines