Bullpup system moves the action and the magazine back behind the trigger, reducing the overall length drastically while still retaining effective downrange performance; QD mount points on both sides of the 5.56mm bullpup, ensuring you can use the sling of your choice, arranged for use from either side; Two-position adjustable gas block with "S" suppressed and "N" normal modes to adapt to conditions and ammo availability; 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; An uninterrupted strip of Picatinny rail runs along the top of the Hellion, ensuring you can mount the optics of your choice to wring out the most performance from the 5.56mm bullpup; Accepts standard AR-15 pattern grips like the included Bravo Company USA BCMGUNFIGHTER Mod 3; Ensures maximum adaptability to a wide range of shooters through its spring-loaded, five-position adjustable buttstock; Polymer handguard features nine M-Lok slots for mounting accessories, three each at the 3, 6 and 9 o'clock positions; Designed to feed from AR-pattern magazines and comes with a 30-round Magpul PMAG