Caliber: .223 Wylde 5.56 Match Grade - Upper Receiver: - Assembled Upper Receiver - AMBI Charging Handle - SKELTON Nitride Bolt Carrier Group - Barrel: - .223 Wylde 5.56 Match Grade Nitride (TRUE 16 Overall Length barrel W/ TCS system) - Mid Length Gas Tube - ADJUSTIBLE .750 Gas Block - Roll Pin - 1/2x28 TPI Thread - 1:8 Twist Rate - Built it Compensator - Lower Receiver: - Complete Lower Receiver - FLAT Olympus9 3-6Lbs Trigger - NU Custom Grip - Enhanced Trigger Guard - EXTENDED MAG RELEASE BUTTON - EXTENDED TAKE DOWN PINS - SAFETY - Muzzle Device: Built-in Tunable Compensator System - Stock Kit: - BATTLELINK Extreme Duty Minimalist Stock - SRS UPGRADED SILENT CAPTURE - Handguard: - 13 Aluminum Jester scalp Rail - MLOK Style - Barrel Nut with Rail Attachment and Screws - Material: 7075 T6 Aluminum - Color: Black Armor Cerakote