The Springfield Hellion 20-Inch 5.56 from Springfield Armory stretches the bullpup layout to a 20-inch barrel, delivering rifle-length velocity in a compact overall length of 32.25 to 33.75 inches (Springfield Armory part no. HL920556B). The ribbed barrel carries a four-prong flash hider and an integral bayonet lug true to the original design. Ambidextrous controls and a reversible ejection system let it run from either shoulder. It suits shooters who want a longer sight radius and more velocity than the 16-inch Hellion, with the same balanced layout.

Key Specifications

• Chambering is 5.56x45mm NATO, a widely available and affordable cartridge.
• The barrel is 20-inch CMV steel with a Melonite finish, ribbed for cooling and a 1:7 twist.
• An integral bayonet lug is part of the barrel, true to the original design.
• The rifle ships with one 30-round Magpul PMAG Gen M3 magazine.
• The operating system is a two-position adjustable short-stroke piston, with S and N settings for suppressed and normal use.
• Sights are integrated flip-up front and rear, with a five-position aperture rear that adjusts for windage.
• The muzzle device is a four-prong flash hider, and the charging handle and safety are ambidextrous.
• The handguard is polymer with M-Lok slots, and QD mount points on both sides support a sling on either side.
• The stock is a five-position adjustable design with a cheek riser, and the grip is a BCMGUNFIGHTER Mod 3.
• Weight is 8 pounds 6 ounces and overall length is 32.25 to 33.75 inches.

Frequently Asked Questions

How is the 20-inch Hellion different from the 16-inch model? It has a 20-inch ribbed barrel with an integral bayonet lug, a 30-round magazine and a longer overall length of 32.25 to 33.75 inches, while the 16-inch model is about 28.25 inches long.

Is it ambidextrous? Yes. The charging handle and safety are ambidextrous, and the reversible case ejection system lets the rifle run from either shoulder.

What magazine does it ship with? It ships with one 30-round Magpul PMAG Gen M3 magazine.

Buy the Springfield Hellion 20-Inch 5.56

The 20-inch barrel adds reach and velocity while the bullpup layout keeps the rifle balanced and compact. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more semi-auto rifles while you are here.