Aero Precision AR15 BAR Barrel Nut and Shims Anodized Black. These AR 15 Parts from Aero Precision feature the proprietary BAR interface for secure installation and precise fit of your Aero Precision forends. Aero Precision AR15 Barrel Nuts are machined from billet aluminum and can be installed with a standard AR15 armorer's wrench and an adjustable torque wrench. Install with confidence when you use the Aero Precision AR15 BAR Interface Barrel Nut & Shims. Specifications for Aero Precision AR-15 BAR Barrel Nut and Shims: Manufacturer: Aero Precision Color: Black Gun Model: AR-15 Condition: New Fabric/Material: 7075-T6 Aluminum Quantity: 1 Finish: Anodized Weight: 2.24 oz Country of Origin: USA Features of Aero Precision AR15 BAR-Style Barrel Nut and Shims 29D-BAN-AR15BRBNSH: Material: Machined from Billet 7075-T6 Aluminum. Coating: Anodized Black. Torque with standard AR15 armorer's wrench (Does not work with Magpul Armorer's Wrench) Supports Mil-Spec AR-15 barrels with outer diameters up to .998 Package Contents: Aero Precision AR15 BAR Mil-Spec Barrel Nut 29D-BAN-AR15BRBNSH BAR Barrel Nut BAR Shim Pack (8 shims) What firearm models does the manufacturer say Aero Precision AR-15 BAR Barrel Nut and Shims is compatible with? The manufacturer says that Aero Precision AR-15 BAR Barrel Nut and Shims is compatible with AR-15Aero Precision APRH100268: AR15 BAR Barrel Nut and Shims Anodized Black