San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO 10.5inch Upper Receiver Carbine Length 1-7 Twist 1/2x28 Threads Black. Specifications for San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO 10.5inch Upper Receiver: Manufacturer: San Tan Tactical Caliber: 5.56x45mm NATO Barrel Length: 10.5 in Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: None Finish: MIL-A-8625 Type 2 Anodize Color: Black Fabric/Material: 6061-T6 Aircraft Grade Aluminum Gas Block Journal Size-Diameter: .750 in Handguard Length: 9.5 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Weight: 10.06 lb Barrel Material: Chrome Moly Vanadium Bolt Carrier Group Included: MIL-SPEC Magazine Included: No Charging Handle Included: MIL-SPEC Buffer Tube Length: Carbine Length Mount Type: Wedge Lock Features of San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO 10.5inch Upper Receiver Built from San Tan Tactical factory components for superior fit finish and durability Compatible with most mil-spec AR-15 lower receivers Ideal for AR-15 builders gunsmiths and DIY firearm enthusiasts Cost-saving alternative to purchasing a complete rifle Backed by San Tan Tacticals reputation for innovation and performance Package Contents: San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO 10.5inch Upper Receiver What firearm models does the manufacturer say San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO 10.5inch Upper Receiver is compatible with? The manufacturer suggests that San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO 10.5inch Upper Receiver is compatible with AR-15San Tan Tactical EBTLK-10.5-BLK: Everything But The Lower AR-15 5.56x45mm NATO 10.5inch Upper Receiver Carbine Length 1-7 Twist 1/2x28 Threads Black