DPMS DP51655115749 Barrel Length: 18″ Barrel Material: 416R Stainless Steel Barrel Profile: A2 Style Chamber: .308 WIN Twist Rate: 1 in 10″ Extension: M4 Gas System: Mid-Length Gas Block Type: Low-profile 5 position click switch adjustable gas block Upper Receiver: Forged 7075 T6 Aluminum Receiver Style: PA10 Flat top with Feed Ramps Receiver Finish: Hardcoat Anodized Forward Assist: Yes Dust Cover: Yes Handguard Type: DPMS 15″ M-Lok Free Float Rail with Anti-slip and anti-rotation features Bolt Carrier Group: Yes, Toolcraft PA10 BCG with extra power extractor spring Staked Gas Key: Yes Lower Receiver: Forged 7075 T6 Aluminum Receiver Finish: Hardcoat Anodized Fire Control Group: Panther Polished Trigger (PPT) Buffer Tube: 7075 T6 Aluminum Adjustment: 6-position telescoping stock Stock: Classic Oracle Carbine Stock, Black Grip: DPMS Custom Overmolded A2 Grip, Black Magazine: 20 Round PMAG