The Kaw Valley Precision MACH 3-Lug Mount is a fully captured, enclosed system designed for use with the KVP MACH Linear Comp system.By utilizing 1-1/8x28 TPI threads, the MACH 3-Lug Mount will fit many common silencer models such as the SilencerCo Octane and Omega K series, Rugged Obsidian and Griffin handgun silencers. The external components are machined from US 4140 Steel and Black Nitride QPQ finished to provide excellent wear properties for a long service life. The MACH system utilizes a 1-1/4 hexagonal wrench flats for easy installation with a standard open end or adjustable wrench.Note: Keep internal o-rings lightly lubricated for better service life.MACH 3-Lug Mount Features: Added Length: .54 Outside Diameter: 1.285 Material: USA Steel Coating: QPQ Black Nitride Weight: 9MM - 2.8oz