This shim pack is designed to work with .308 Win and 6.5 Creedmoor barrels. It will not work with AR-15 barrels. Includes 5 shims
NOTE: This product is already included with Aero's M5E1 Handguard Barrel Nut. It is not necessary to be purchased separately. This individual product is available for customers who have lost or damaged their existing .308 shims.