The Complete Upper is constructed of billet machined 7075-T6 aluminum with proprietary Extended aluminum hand guard w/ Magpul M-LOK mounting system and integrated upper/hand guard stainless steel anti-rotation pin. Its match grade 416R stainless steel barrel has polished crown/feed ramps, and is threaded. The upper also utilizes enhanced black nitride M16 BCG, lightweight forward assist, Radian Raptor-SD suppressor-optimized ambidextrous charging handle, and a direct impingement gas system.