NEMO Arms Builder Series AR-15 Small Frame Forged Upper Receiver Type 3 Hard Coat Black Anodized. With enhanced features such as screw-in pins and superior fit and finish vs. standard mil-spec forgings youll love the quality feel of your finished rifle. Specifications for NEMO Arms Builder Series AR-15 Small Frame Forged Upper Receiver: Manufacturer: NEMO Arms Finish: Black Hard Anodize Color: Black Fabric/Material: 7075-T6 Aluminum Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Weight: 7 oz Dimensions: 7.63x2.31x2.13 in Package Contents: NEMO Arms Builder Series AR-15 Small Frame Forged Upper Receiver What firearm models does the manufacturer say NEMO Arms Builder Series AR-15 Small Frame Forged Upper Receiver is compatible with? The manufacturer says that NEMO Arms Builder Series AR-15 Small Frame Forged Upper Receiver is compatible with AR-15NEMO Arms NBP-SF-RU: Builder Series AR-15 Small Frame Forged Upper Receiver Type 3 Hard Coat Black Anodized