If you own an AR pattern rifle you probably love to tinker with it. Smart-Fit Vise Blocks give you an extra "set of hands" when working on your rifle. The Smart-Fit Vise Block Sleeve for AR10 is an innovative product that allows you to work on large frame ARs with precise fit and zero wobble. It is designed to slide over the existing Real Avid Smart-Fit AR15 Vise Block and eliminates any wiggle or movement while working on the firearm. The sleeve can be used with an inverted lower receiver to work on pistol grips or allow easy access to the underside of your AR. It is a must-have tool for securing an AR when swapping trigger groups, servicing the lower receiver, installing grips and buffer tubes, or easily cleaning the barrel borSpecifications and Features: Item number: AVAR10SFVBS Slips Over AR-15 Vise Block to Convert to AR10 Vise Block Provides a Secure Base When Working on Your Large Frame AR Works for Upright or Inverted Receivers NOT Compatible with AR10B Does NOT Include the AR15 Smart-Fit Vise Block (Sold Separately)