KAK Industry TYPE 42 V2 Style Flash Hider 1/2-28 Inspired from the WWII MG42 era flash hiders Perfect for your retro, steampunk, or space builds Overall Length- 1.750" Threads- 1/2-28 Bore- Up to 9mm Weight- 2.08oz Heat Treated for strength and durability Phosphate Coated for corrosion resistance Milled flats for easy installation Fully Precision Machined in House at KAK Industry Crush washer not included