The Lancer Systems L5AWM AR-15 Magazine – 10 Rounds Trans Clear .223/5.56 is a polymer and steel hybrid that combines the best features of each material. The one-piece steel feed lip unit is permanently fixed to the polymer body. The steel is hardened so the dimensions will not change in long term storage or rough use. The PTFE coating ensures the steel will not rust. The polymer body is designed with an internal dimension that is a constant curve, combined with a no-tilt follower for maximum reliability in feeding 5.56x45mm NATO ammunition. The steel feed lip assembly and the polymer body are corrosion and chemical resistant. The floor plate slides off similar to a USGI magazine for cleaning and maintenance.