Shooting accurately requires a solid rest. The NRA Tactical Sight-Bloc™ is as solid as they come – plus, it’s virtually indestructible! Manufactured from a patented rubber composite with UV protection, the Sight-Bloc™ endures extreme climate conditions without becoming soggy (like sandbags) or rusty (like steel rests). Currently used and approved by US Military and Law Enforcement agencies, its molded rubber construction provides a stable, repeatable rifle rest that can be easily repositioned to provide three different shooting heights. Simply rotate the Sight-Bloc™, and choose your level: 4”, 7” or 9” (perfect for AR-15 platform rifles with full-capacity magazines). Dimensions: 11” x 8¾” x 6”. Weight: 14 lbs. Made in USA