ETS magazines are made from advanced polymers that provide extreme impact resistance so they wont crack or break when dropped. With superior temperature tolerances ETS magazines wont become brittle over time, even when exposed to harsh environments, chemicals, or extreme cold. Its durable construction eliminates creep so the feed lips and body wont spread when being stored long term, even when fully loaded.Features :40- Round CapacityPrecise ManufacturingLong Term ReliabilityDurable ConstructionHigh Capacity