Dark Storm Industries DS-15 AR-15 Typhoon .300 AAC Blackout 12.5in Upper Receiver 1/ 8 Twist Pistol Length Gas Black Anodize. Featuring a 12.5" SOCOM barrel and Firestorm compensator this upper is ready to handle demanding use while maintaining exceptional accuracy and durability. Perfect for your next Non NFA build. Specifications for Dark Storm Industries DS-15 AR-15 Typhoon .300 AAC Blackout 12.5in Upper Receiver: Manufacturer: Dark Storm Industries Caliber: .300 AAC Blackout Barrel Length: 12.5 in Barrel Profile: SOCOM Gas System Length: Pistol Length Barrel Twist Rate: 1-8 Firearms Threads Per Inch: 5/8x24 Muzzle Device: Firestorm Compensator Fabric/Material: 4150 CMV Steel 7075-T6 Aluminum Handguard Length: 10 in Gun Rail: Picatinny Gun Make: AR Platform Gun Model: AR-15 Barrel Material: Steel Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Features of Dark Storm Industries DS-15 AR-15 Typhoon .300 AAC Blackout 12.5in Upper Receiver Mil-Spec pinned forward assist Threaded forward assist screw Mil-Spec dry film lubricated bore DSI Atach ambidextrous charging handle DSI Mil+ Bolt Carrier Group 8620 bolt carrier (diamond honed bore) 9310 bolt (enhanced profile) 4130 gas key (Grade 8+ Torx staked) 8740 steel ground chrome firing pin Springco XP 5 coil extractor spring DSI SOCOM Profile Barrel Button rifled Pistol gas system Package Contents: Dark Storm Industries DS-15 AR-15 Typhoon .300 AAC Blackout 12.5in Upper Receiver What firearm models does the manufacturer say Dark Storm Industries DS-15 AR-15 Typhoon .300 AAC Blackout 12.5in Upper Receiver is compatible with? The manufacturer says that Dark Storm Industries DS-15 AR-15 Typhoon .300 AAC Blackout 12.5in Upper Receiver is compatible with AR-15Dark Storm Industries DSI-UC5-TYP-12P8-T3-BLK: DS-15 AR-15 Typhoon .300 AAC Blackout 12.5in Upper Receiver 1/ 8 Twist Pistol Length Gas Black Anodize