Springfield Hellion - Semi-automatic Rifle - Bullpup - 223 Remington/556NATO - 20" Hammer Forged Barrel with Bayonet Lug - 1:7 Twist - 4 Prong Flash Hider - Matte Finish - Black - BCM MOD 3 Grip - 5-Position Adjustable Stock with Cheek Riser - Front/Rear Flip Sights - 2-Position Short Stroke Gas Piston - Ambidextrous Safety - Ambidextrous Charging Handle - MLOK Handguard Reversible Ejection System