Luth-AR AR-15 - Extractor O-Ring Black

Luth-AR AR-15 - Extractor O-Ring Black. Specifications for Luth-AR AR-15 Extractor O-Ring: Manufacturer: Luth-AR Color: Black Caliber: .223 Remington Gun Model: AR-15 Package Contents: Luth-AR AR-15 Extractor O-Ring What firearm models does the manufacturer say Luth-AR AR-15 Extractor O-Ring is compatible with? The manufacturer says that Luth-AR AR-15 Extractor O-Ring is compatible with AR-15Luth-AR BT-08-OR: AR-15 - Extractor O-Ring Black