With enhanced durability and improved function, the new and improved DPMS .308 upper is here. This model offers a black nitride gas tube to better resist high heat and corrosion while maintaining a glossy black finish. All DP10 models come with a dimpled barrel for ease of gas block replacement if you choose to do so. We have also included a newly designed click switch position adjustable gas block so you can specifically tune to your load. DP10 Upper Benefits at a Glance: Dimpled Nitride FinishAdjustable Click Switch Gas BlockExtra Power Extractor Springs7075 T6 Charging Handle Included in all uppersBlack Nitride Gas TubeBarrel Nuts properly torqued to military specificationsAnti-slip and anti-rotation handguards Barrel: The dimpled, nitride 308 WIN 1/10 twist, rifle length gas system upper is paired with a Panther Arms 15" M-Lok free-float partial picatinny rail, low profile adjustable click detent 3 position gas block, and an A2-style muzzle device. The gas system is enhanced with a nitrided gas tube in order to better resist high heat and corrosion. Upper: Precision machined from forged 7075-T6 aluminum, then Black anodize hard coated to MIL-8625 Type 3 class 2. With enhanced dual retention anti-slip and anti-rotating handguards. Bolt Carrier Group: Tool craft 9310 steel bolt assembly with extra strength extractor springs that is nitride for increased durability. 8620 carrier, nitride treated, with a nitride treated gas key properly staked with grade 8 fasteners. A 7075 T6 aluminum charging handle is also included.