LANTAC USR Upper Receiver Forged. Type 3 hard coat anodized class 2 deep black finish. M4 three ramps included as well. The LANTAC USR Upper Receiver Stripped AR-15 is ideal for a new rifle build where quality and accuracy are paramount. This receiver is a perfect choice for your next project or as an upgrade to your existing parts on your current rifle. Specifications for LANTAC USR Forged Upper Receiver: Manufacturer: LANTAC Color: Black Finish: Milspec Type3/Class2 Deep Black Hardcoat Anodize Forged Fabric/Material: Billet 7075-T6 Aluminum Gun Make: AR Platform Gun Model: M4 Condition: New Weight: 7 oz Package Contents: LANTAC USR Forged Upper Receiver What firearm models does the manufacturer say LANTAC USR Forged Upper Receiver is compatible with? The manufacturer says that LANTAC USR Forged Upper Receiver is compatible with M4LANTAC 01-RV-UP-USR-SF15: USR Upper Receiver Forged