Our new crowned muzzle brake for the Tec 9 & KG-99 is made of machined steel and finished in black oxide for durability. It has five machined, slotted ports and its' crown works great for door breach situations, self defense and adds a custom appearance to any Tec 9 or KG 99 gun. It is 3" inches in length and weighs only 5 ounces. It has a thread of 3/4x10 OS. (gun & other parts sold separately.