The Springfield Armory Hellion is a semi-automatic bullpup rifle chambered in 5.56 NATO (.223 Rem) with a 20-inch barrel. It has a 10-round capacity and a black finish. The bullpup layout keeps overall length compact while retaining the full 20-inch barrel. 
 

Key Specifications 

• Brand: Springfield Armory 
• Model: Hellion 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 20 in 
• Color/Finish: Black 
   

Detailed Features 

• 20-inch barrel in a bullpup configuration 
• Chambered in 5.56 NATO, also accepts .223 Rem 
• 10-round magazine capacity 
• Low-profile flip-up sights 
• Black finish throughout

Owners of the Springfield Armory Hellion frequently point to the bullpup layout as the defining characteristic. The combination of a 20-inch barrel and bullpup packaging gives it a noticeably shorter overall length than a traditional rifle with the same barrel, and that trade-off is the primary reason most buyers choose it.

The trigger gets mixed reviews, as is typical for bullpup designs. The linkage required by the bullpup layout produces a trigger feel that some owners accept as adequate and others find disappointing compared to traditional rifle triggers. Ergonomic adjustments take time, and shooters coming from conventional AR-pattern rifles often need a transitional period.

Build quality on the Hellion is generally rated positively, with owners noting solid materials and consistent finish. The 10-round capacity is a point of friction for those in standard-capacity states, though the platform's function with a variety of magazine options is cited as a practical benefit.