Black Rain Ordnance Ejection Port Cover Assembly 5.56/.223 Caliber. When closed it appears to be a simple cover pop the charging handle and Let It Rain is stamped on the inside of the cover. Comes with all hardware needed to install. 5.56mm/.223 Caliber. Specifications for Black Rain Ordnance Ejection Port Cover Assembly 5.56/.223 Caliber BRO-EDC: Manufacturer: Black Rain Ordnance Color: Black Gun Model: AR-15 The Black Rain Ordnance Ejection Port Cover Assembly 5.56/.223 Caliber BRO-EDC is a quality addition to the Black Rain Ordnance lineup. For more great deals on AR15 Upper Parts by Black Rain Ordnance please browse our Black Rain Ordnance Gun Parts page. What firearm models does the manufacturer say Black Rain Ordnance Ejection Port Cover Assembly 5.56/.223 Caliber BRO-EDC is compatible with? The manufacturer says that Black Rain Ordnance Ejection Port Cover Assembly 5.56/.223 Caliber BRO-EDC is compatible with AR-15Black Rain Ordnance Ejection Port Cover Assembly 5.56/.223 Caliber