Geissele Automatics 05-231N Super Gas Block AR-15 Steel Black Nitride .750" The Super Gas Block's (SGB) Bore Is machined To Closely Fit Around .750 Diameter Mounting bosses Found On Most M4 Carbines And AR-15 Rifles. Type: Gas Block Model: AR-15 Dimensions: .750" Material: Steel Finish: Black Nitride
Manufacturer: Geissele Automatics Mfg Number: 05-231N Model: Super Series: Gas Block
