Infinite Product Solutions 1in Barrel Extension Black Phosphate M13.5 x 1 LH - 9mm Luger. Key for clearing handguards or maintaining barrel length requirements. Precision made and accurately engineered this extension is available in black nitrided 17-4 PH H1150 stainless steel black oxide steel or black phosphate steel offering superior durability and a sleek appearance. The divot on the nitrided versions allows for easy pin and weld applications ensuring compliance with legal barrel length requirements. This barrel extension passes strict quality standards is corrosion and water-resistant and is easy to accommodate with rails and other barrel accessories. Specifications for Infinite Product Solutions 1in Barrel Extension: Manufacturer: Infinite Product Solutions Color: Black Fabric/Material: Steel Features of Infinite Product Solutions 1in Barrel Extension Adds 1 inch to the shooter's barrel Accurately engineered and manufactured Divot on nitrided models for easy pin and weld applications for legal barrel length additions Easy to accommodate rails and other barrel accessories Passes strict quality standards Corrosion and water resistant Package Contents: Infinite Product Solutions 1in Barrel Extension Infinite Product Solutions 135LH-EXT-1IN-BS: 1in Barrel Extension Black Phosphate M13.5 x 1 LH - 9mm Luger