Springfield Hellion, Semi-automatic Rifle, Bullpup, 223 Remington/556NATO, 20 Hammer Forged Barrel with Bayonet Lug, 1:7 Twist, Springfield Armory Muzzle Brake, Matte Finish, Black, Strike Industries Simple Featureless Grip, Fixed Stock, Front/Rear Flip Sights, 2-Position Short Stroke Gas Piston, Ambidextrous Safety, Ambidextrous Charging Handle, MLOK Handguard Reversible Ejection System, 10 Rounds, 1 Gen3 Magpul PMAG, California Compliant HL920556BCA Redefining perceptions of semi-automatic 5.56 performance; the Hellion from Springfield Armory represents a radically unique and innovative approach to firearms design. Featuring both compact dimensions and capable downrange performance; the Hellion with 20" barrels offer bullpup fans even more options. With the action located behind the trigger; the 5.56mm Hellion offers extremely compact dimensions even with these longer-barreled new variants. In addition to enhanced ballistic performance with both models; the 20" version comes standard with a ribbed barrel for maximum rigidity and heat dissipation. It also is capable of accepting a military-pattern bayonet on its integrated bayonet lug. Fully ambidextrous controls and reversible ejection round out the package for maximum adaptability.