Aero Precision AR15 BAR Shim Pack Stainless. It will not work with .308 Win and 6.5 Creedmoor barrels or barrel nuts. Includes 8 shims. NOTE: This product is already included with our AR-15 BAR barrel nut. It is not necessary to be purchased separately. This individual product is available for customers who have lost or damaged their existing AR-15 BAR barrel nut shims. Specifications for Aero Precision AR15 BAR Shim Pack: Manufacturer: Aero Precision Condition: New Color: Stainless Quantity: 1 Country of Origin: USA Package Contents: Aero Precision AR15 BAR Shim Pack Aero Precision APRH100267C: AR15 BAR Shim Pack Stainless