Tiger Rock AR-15 Upper Receiver Vise Block. These Gunsmithing Equipment designed by Tiger Rock allow you to clamp your upper receiver in a gunsmithing vise where you can then tightly clamp it to secure it protecting the finish on your rifle. The Tiger Rock AR-15 Upper Receiver Vise Block is constructed from heavy-duty glass-filled polymer that can withstand the wear and tear of your gunsmithing tools and provides a safe harbor for your weapon. This device is also EXTREMELY USEFUL for building or modifying your rifle with an aftermarket receiver. Get yours today and watch it put a stop to any unintended damage your rifle may cause. Specifications for Tiger Rock AR-15 Upper Receiver Vice Block: Manufacturer: Tiger Rock Finish: Matte Gun Model: AR-15 Gun Make: AR Platform Gun Type: Rifle Fabric/Material: Glass-filled Polymer Color: Black Weight: 12.5 oz Condition: New Length: 4.625 in Width: 3.25 in Package Contents: Tiger Rock AR-15 Upper Receiver Vice Block What firearm models does the manufacturer say Tiger Rock AR-15 Upper Receiver Vice Block is compatible with? The manufacturer says that Tiger Rock AR-15 Upper Receiver Vice Block is compatible with AR-15Tiger Rock UP: AR-15 Upper Receiver Vise Block