Birchwood Casey AR 15 Upper Receiver Vise Block Super Compact Never miss a target with HOR546537 Never miss a target with Cypher and its innovative tuning reference for the most accurate and consistent results Fuji® reel seats coupled with EVA and carbon rear split grip design allow for reduced weight and increased sensitivity Product Features • Installs to upper receiver on standard AR 15 or equivalent rifles • Clamps in any vise allowing easy access for cleaning assembly • CNC construction for precise fitment • Soft jaw design will not mar the receiver • Includes snap pins for secure engagement to the receiver • Allows user to install and torque down the barrel to the receiver