Springfield Armory's Hellion answers the call for superior ballistic performance in a short, adaptable platform. Featuring a bullpup configuration where the action is located behind the trigger, the Hellion features an overall length of just 28.25-inches while still possessing a 16 barrel. To ensure the maximum in flexibility and performance, the Hellion bullpup features a two-position adjustable gas block with S suppressed and N normal modes. It sports ambidextrous controls that work in concert with a reversible case ejection system, allowing it to be easily fired from either shoulder. Integrated into the Picatinny top rail of the Hellion is a set of sturdy and capable flip-up iron sights. These spring-loaded sights quickly pop into position, locking solidly until released. It accepts standard AR-15 pattern grips like the included Bravo Company USA BCMGUNFIGHTER Mod 3. The polymer handguard features nine M-Lok slots for mounting accessories, three each at the 3, 6 and 9 o'clock positions. The Springfield Armory Hellion bullpup ensures maximum adaptability to a wide range of shooters through its spring-loaded, five-position adjustable buttstock.