The Springfield Armory Hellion is a bullpup semi-automatic rifle chambered in 5.56x45mm NATO (.223 Rem) with a 16-inch barrel, gas piston operating system, and gray finish. Capacity is 30+1 rounds. Weight is 8 lbs. 
 

Key Specifications 

• Caliber: 5.56x45mm NATO (.223 Rem) 
• Action: Semi-Auto (Gas Piston) 
• Capacity: 30+1 rounds 
• Barrel Length: 16 inches 
• Weight: 8 lbs. 
• Sights: Flip-up front & rear sights 
• Optic Mount: 1913 Picatinny rail 
• Muzzle Type: Flash hider 
• Finish: Gray 
• Stock Type: 5-position adjustable with cheek riser 
   

Detailed Features 

• Short-stroke gas piston system, two-position adjustable 
• Five-position adjustable stock with cheek riser 
• Flip-up front and rear sights, elevation- and windage-adjustable 
• Ambidextrous charging handle and safety switch 
• Melonite finish on critical components 
• 1913 Picatinny optic rail 
   
  The bullpup layout puts the action behind the trigger, which is how the Hellion keeps a 16-inch barrel in a noticeably shorter overall package than a conventional rifle. The two-position adjustable gas block covers both standard and suppressed configurations. The gray Melonite finish resists corrosion and reduces surface glare.

The Springfield Hellion Bullpup in gray 5.56 NATO draws consistent feedback on the platform's core strengths and limitations.

The compact profile for the barrel length is the most frequently cited advantage -- owners who have handled and shot both conventional ARs and the Hellion note the difference in overall length immediately. Accuracy with the 16-inch barrel is solid, and the gas piston system keeps fouling manageable.

Trigger pull is the most common criticism. Bullpup trigger linkages inherently add length and complexity, and the Hellion's trigger is heavier and less crisp than most users would prefer. It's functional but not a match trigger. Weight distribution is also noted -- the rear-heavy balance of a bullpup feels different from a conventional rifle, and shooters have mixed reactions.

Magazine compatibility is primarily STANAG pattern. Some aftermarket magazines have fitment variability. The gray finish is well-received aesthetically and holds up to normal use. Comparisons to the Tavor X95 and IWI Zion come up frequently in buying discussions.