Dark Storm Industries DS-15 MOE AR-15 .300 AAC Blackout 16in Upper Receiver Pistol Length 1-8 Twist A2 Style Birdcage Flash Hider Olive Drab Green. This upper offers a SOCOM profile barrel with a classic A2 style birdcage flash hider in multiple finishes. Specifications for Dark Storm Industries DS-15 MOE AR-15 .300 AAC Blackout 16in Upper Receiver: Manufacturer: Dark Storm Industries Caliber: .300 AAC Blackout Barrel Length: 16 in Barrel Profile: SOCOM Barrel Twist Rate: 1-8 Firearms Threads Per Inch: 5/8x24 Muzzle Device: A2 Flash Hider Gun Model: AR-15 Fabric/Material: 7075 Aluminum Gun Make: AR Platform Barrel Material: Steel Features of Dark Storm Industries DS-15 MOE AR-15 .300 AAC Blackout 16in Upper Receiver Mil-Spec pinned forward assist Mil-Spec dry film lubricated bore DSI Standard 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 16 SOCOM Profile Barrel Button rifled Carbine or Pistol length gas system Package Contents: Dark Storm Industries DS-15 MOE AR-15 .300 AAC Blackout 16in Upper Receiver What firearm models does the manufacturer say Dark Storm Industries DS-15 MOE AR-15 .300 AAC Blackout 16in Upper Receiver is compatible with? The manufacturer says that Dark Storm Industries DS-15 MOE AR-15 .300 AAC Blackout 16in Upper Receiver is compatible with AR-15Dark Storm Industries DSI-UC5-MOE-6P8-T3-ODX: DS-15 MOE AR-15 .300 AAC Blackout 16in Upper Receiver Pistol Length 1-8 Twist A2 Style Birdcage Flash Hider Olive Drab Green