Precision Reflex Upper Assembly Vise Block for AR-10/AR-15 Anodized Aluminum Black. The upper is held into place with two receiver pins. The assembly block is constructed of hard coat black anodized aluminum with steel retention pins. This vise block does not work with the new DPMS GII rifle. Specifications for Precision Reflex Upper Assembly Vise Block: Manufacturer: Precision Reflex Finish: Hard Coat Anodized Gun Model: AR-15 Gun Make: AR Platform Fabric/Material: T6 6069 Color: Black Package Contents: Precision Reflex Upper Assembly Vise Block What firearm models does the manufacturer say Precision Reflex Upper Assembly Vise Block is compatible with? The manufacturer suggests that Precision Reflex Upper Assembly Vise Block is compatible with AR-15Precision Reflex 03-0084: Upper Assembly Vise Block for AR-10/AR-15 Anodized Aluminum Black