Presma AR-15 Upper Vise Polymer Block Black. Specifications for Presma AR-15 Upper Vise Block: Manufacturer: Presma Gun Model: AR-15 Gun Type: Rifle Fabric/Material: Polymer Color: Black Projectile Caliber: .223 Caliber Quantity: 1 Features of Presma AR-15 Upper Vise Block Allows safe clamping of upper receiver into a vise Perfect for repair service or weapon assembly Will not crush distort or mar the receiver Fits Both Carry & Flattop Uppers Package Contents: Presma AR-15 Upper Vise Block What firearm models does the manufacturer say Presma AR-15 Upper Vise Block is compatible with? The manufacturer says that Presma AR-15 Upper Vise Block is compatible with AR-15Presma UVB: AR-15 Upper Vise Polymer Block Black