ATI Outdoors AR-15 .223/5.56 Muzzle Brake Jam Nut Black One Size. 223/5.56 Steel Muzzle Brake Jam Nut Specifications for ATI Outdoors AR-15 .223/5.56 Muzzle Brake Jam Nut: Manufacturer: ATI Outdoors Additional Features: Standard Included Accessories: Standard Gun Model: AR-15 Color: Black Fabric/Material: Steel Activity/Occasion: Work Sports Duty Hike Travel Casual Outdoor Size: One Size Age Group: Adults Caliber: .223 Remington 5.56x45mm NATO Quantity: 1 Application: Tactical Work Outdoor Everyday Casual Fit: Regular Seasonal/Temperature Use: All Seasons Style: Tactical Gender: Unisex Features of ATI Outdoors AR-15 .223/5.56 Muzzle Brake Jam Nut Fits rifles .223/5.56mm Heat treated steel CNC presision machined Corrosion resistant Package Contents: ATI Outdoors AR-15 .223/5.56 Muzzle Brake Jam Nut What firearm models does the manufacturer say ATI Outdoors AR-15 .223/5.56 Muzzle Brake Jam Nut is compatible with? The manufacturer says that ATI Outdoors AR-15 .223/5.56 Muzzle Brake Jam Nut is compatible with AR-15ATI Outdoors A.5.10.2255: AR-15 .223/5.56 Muzzle Brake Jam Nut Black One Size