The design philosophy behind the Radian Model 1 is simple: use the highest quality raw materials, most precise CNC machining equipment, and best components available to create a weapon that seamlessly blends form and function. Beyond quality and aesthetics, the Model 1 features fully ambidextrous controls, adding much-needed utility for both left and right handed shooters. Every Model 1 is assembled by hand, one at a time, by a trained gunsmith who inspects, test fires, and cleans the weapon to personally guarantee it meets the most rigid quality standards. No detail has gone overlooked, which is why the Model 1, like every Radian product, is guaranteed for life. Specifications for Radian Weapons Model 1 Complete Upper Receiver: Manufacturer: Radian Weapons Muzzle Device: Flash Hider Condition: New Attachment/Mount Type: M-LOK Gun Rail: M-LOK Barrel Material: 416R Stainless Steel Gas Block Journal Size-Length: 0.75 in Country of Origin: USA Features of Radian Weapons Model 1 Complete Upper Receiver:Sub-MOA accuracy guarantee w/ Black Hills match grade ammunition.Proprietary extended hand guard w/ Magpul M-LOK modular mounting system and integrated upper/hand guard anti-rotation pin.Lightweight forward assist.Radian raptor-SD suppressor-optimized ambidextrous charging handle.Direct impingement gas systemSilencerCo ASR Flash hider/suppressor mount or dead air flash hider/Muzzle brake.the item comes with a DEAD AIR KeyMo Flash Hider. Package Contents: Radian Weapons Model 1 Complete Upper Receiver