The Springfield Armory Hellion is a bullpup semi-automatic rifle chambered in 5.56x45mm NATO with a 20-inch barrel, black finish, and gas piston operating system. Capacity is 30+1 rounds. Overall length is 32.25" to 33.75" depending on stock position. Weight is 8.39 lbs. Includes a Magpul PMAG Gen M3 magazine. 
 

Key Specifications 

• Model: Hellion 
• Caliber: 5.56x45mm NATO 
• Action: Semi-Auto (Gas Piston) 
• Capacity: 30+1 rounds 
• Barrel Length: 20 inches 
• Overall Length: 32.25" - 33.75" 
• Weight: 8.39 lbs 
• Finish: Black 
• Sights: Integrated Flip-Up Front & Rear 
• Stock: Adjustable with Cheek Riser 
   

Detailed Features 

• Bullpup configuration: 20-inch barrel in a 32.25" to 33.75" overall package 
• Ambidextrous safety switch and charging handle 
• Five-position adjustable stock with cheek riser 
• Two-position adjustable short-stroke piston gas system 
• Integrated flip-up sights 
• Included: Magpul PMAG Gen M3 magazine 
   
  The 20-inch barrel in a sub-34-inch overall length is a direct result of the bullpup layout. A conventional rifle with a 20-inch barrel runs considerably longer. The included PMAG Gen M3 is a quality baseline magazine. The two-position gas system handles both standard and suppressed modes.

The Springfield Hellion 5.56 NATO Semi-Auto Bullpup Rifle draws well-established feedback common to the Hellion platform.

The 20-inch barrel in a compact overall length is the headline feature and gets consistent mention. Users appreciate the ballistic benefit of a longer barrel without the handling length of a conventional full-size rifle. Accuracy is generally praised. Build quality earns positive marks across reviews.

Trigger feel is the most consistent point of criticism. The bullpup mechanism produces a heavier, longer trigger pull compared to direct-mounted triggers, which experienced shooters tend to notice. Weight distribution is noted as different from a conventional rifle layout.

Customization options are discussed as adequate for most users, with the Picatinny optic rail and flip-up sights covering the basics. Aftermarket parts specific to the Hellion are more limited than the AR-15 ecosystem. Comparisons to the IWI Tavor X95 and AUG come up in buying discussions. Price falls at the higher end for the bullpup segment.