Aluminum 1 Port Lil’ Bear Muzzle Brake Aluminum 1 Port Lil’ Bear Muzzle Brake Specifications: Thread Pitch: 5/8-24 Length: 1.425 inches long Weight: .8 ounces (You read that right, less than 1 ounce!) Material: Aluminum – hard coat anodized black. Diameter: .995 with a taper on timing nut to .970. Bore Diameter: Intended for cartridges as small as 223 Remington all the way up to 338-378 Weatherby! Each and every muzzle brake is carefully inspected, chamfered, deburred & polished before shipping. J&A Outdoors – Firearm Solutions – Shooting Products (jaoutdoors.com)