The Springfield Armory Hellion is a 5.56 NATO bullpup semi-automatic rifle with a 16-inch barrel. It has a 5-position adjustable stock, MOD 3 grip, and a 1:7 twist barrel, with a 30+1 round capacity. 
 

Key Specifications 

• Brand: Springfield Armory 
• Model: Hellion 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 30+1 rounds 
• Barrel Length: 16 in 
• Color/Finish: Black 
   

Detailed Features 

• 16-inch barrel in a bullpup layout 
• 5-position adjustable stock 
• MOD 3 grip 
• 1:7 twist rate 
• Crimson Trace CTS-103 red/green dot included in Gear Up package

Hellion owners in the 16-inch configuration frequently note the advantage of a full-length barrel in a compact overall package that the bullpup layout provides. Springfield Armory implementation of the forward ejection system draws positive comments for making the rifle genuinely ambidextrous, not just partially so.

The 5-position adjustable stock and MOD 3 grip suit a range of shooter builds, and the Crimson Trace CTS-103 Gear Up bundle is seen as a strong value add. The trigger, given the bullpup mechanical linkage, splits opinion: some find it predictable and acceptable, while others find it heavier than they prefer.

Reliability feedback in owner communities is generally positive, though the Hellion relative newness compared to traditional AR-pattern platforms means the sample of long-term data is smaller. Most complaints center on aesthetics and trigger feel rather than mechanical failures.