Our new crowned muzzle brake 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 tactical weapon. It is 3" inches in length and weighs only 5 ounces. It has a thread of 3/4x10 and it is paired with our thread adapter 3/4-10 to 1/2-28 and it will thread onto any Kel Tec with barrel threads of 1/2-28. (gun & other items sold separately)* Please our BARREL THREADING SECTION for threading your Kel Tec rifle.