UnbrandedAR Contract Forged 7075 A4 Upper Receiver Hard Black-anodized Finish Black. These AR15 upper receivers by Unbranded are M4 feed ramped and hold true to the AR15 platform. This makes a perfect upper for your next modification or build out. The top of the receiver is left oversized so that you can use it as a lightweight barricade block or to hold a handguard or other accessories that you may need in the future. Compatible with most AR platforms the Unbranded AR 7075 A4 M4A4 Upred Receiver is a high-quality piece that will help you create a top-quality firearm using some of the finest parts on the market period. Specifications for UnbrandedAR Contract Forged 7075 A4 Upper Receiver: Manufacturer: UnbrandedAR Color: Black Finish: Black Hardcoat Anodized Fabric/Material: 7075-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Condition: New Gun Type: Rifle Features of UnbrandedAR Contract Forged 7075 A4 Upper Receiver M4 feed ramps Marked 'M4' above gas tube inlet hole NON T-Marked Package Contents: UnbrandedAR Contract Forged 7075 A4 Upper Receiver What firearm models does the manufacturer say UnbrandedAR Contract Forged 7075 A4 Upper Receiver is compatible with? The manufacturer says that UnbrandedAR Contract Forged 7075 A4 Upper Receiver is compatible with AR-15UnbrandedAR 7032-0016-4121: Contract Forged 7075 A4 Upper Receiver Hard Black-anodized Finish Black