The Spike's Tactical Laser Engraved Ejection Port Doors are an easy and inexpensive way to personalize your AR-15. With so many choices available, it will take you longer to choose than it will to install. It is a Mil-Spec ejection port door constructed from stamped steel and it has a Mil-Spec phosphate coating. It comes with "Semper Fidelis" laser-engraved on it.