The Springfield Armory Hellion is a bullpup semi-automatic rifle chambered in 5.56x45mm NATO (.223 REM) with a 16-inch barrel, black anodized finish, and gas piston operating system. Capacity is 30+1 rounds. Weight is 8 lbs. Overall length is 28.25" to 29.75" depending on stock position. 
 

Key Specifications 

• Model: Hellion 
• Caliber: 5.56x45mm NATO (.223 REM) 
• Action Type: Semi-Automatic 
• Barrel Length: 16 inches 
• Overall Length: 28.25" - 29.75" 
• Capacity: 30+1 rounds 
• Weight: 8 lbs 
• Finish: Black Anodized 
• Stock Type: 5 Position Adjustable with Cheek Riser 
• Sights: Flip-Up Front & Rear 
   

Detailed Features 

• Bullpup configuration: action and magazine behind the trigger, reduces overall length while maintaining 16-inch barrel 
• Ambidextrous safety switch and charging handle 
• Five-position adjustable stock with cheek riser 
• Two-position adjustable gas block: suppressed and normal modes 
• Integrated flip-up sights, elevation-adjustable front and windage-adjustable rear 
   
  The two-position gas block explicitly labels its two positions for suppressed and normal use, which is a practical detail for NFA owners. At 28.25 to 29.75 inches overall with a 16-inch barrel, the length difference versus a conventional 16-inch AR is noticeable.

The Springfield Hellion Bullpup in black draws consistent feedback on the platform's core characteristics.

The compact overall length for the barrel length is the primary stated advantage. Shooters coming from conventional ARs note how much shorter the Hellion feels with the same 16-inch barrel, and for users who work in tighter spaces this translates to a practical difference. Gas piston operation keeps fouling out of the action, which owners who run extended strings appreciate.

Trigger pull is the persistent criticism. The bullpup linkage adds length and weight to the pull compared to a direct-mounted trigger, and this comes up in nearly every detailed review. Weight distribution is also noted -- the rear balance point of a bullpup feels different from a conventional rifle and takes adjustment.

Accessory support through the Picatinny rail and flip-up sights covers most users' needs, but the Hellion aftermarket is much smaller than the AR-15 ecosystem. Comparisons to the Tavor X95 are common. Price is at the higher end for a bullpup 5.56 platform.