Brownells Upper Vise Block Features The Brownells Upper Vise Block holds an AR-15 upper receiver securely in a bench vise using included stainless steel pins that pass through the receiver s takedown pin holes. This method distributes clamping force evenly and keeps the upper from shifting while builders torque barrel nuts install gas blocks or seat handguards. Made from high density polyethylene the block itself will not mar or scratch the receiver s finish during repeated use. The stainless steel pins resist corrosion and wear ensuring the block continues to hold uppers securely over years of shop use. At 7.41 inches long and 2.7 inches wide the block is sized to accommodate most standard AR-15 upper receivers without interference. Brownells designed this vise block specifically for gunsmiths armorers and home builders who need a dependable way to stabilize an upper during detailed assembly work. Pairing this block with a Brownells bench vise creates a complete purpose built workstation for AR-15 upper receiver builds. This tool is a practical addition to any serious AR platform builder s bench. Brownells Upper Vise Block Specifications Manufacturer: Brownells Model: Upper Vise Block Compatible Hosts: AR-15 Material: Polyethylene Length: 7.41 Width: 2.7 Height: 2.6 Available At: GrabAGun