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SPRINGFIELD ARMORY – HELLION BULLPUP 5.56 16″. Redefining our notions of semi-automatic 5.56 performance, the new Hellion from Springfield Armory is a fundamentally fresh and revolutionary approach to guns design. Featuring a “bullpup” layout where the action is positioned behind the trigger, the Hellion offers an overall length of only 28.25-inches while yet sporting a 16” barrel. The Hellion boasts ambidextrous controls that function in unison with a reversible case ejection mechanism, enabling it to be readily shot from either shoulder. The result? A 5.56 blends portability with performance.


  • Action Type: Gas Operated
  • Barrel Length: 16″
  • Capacity: 30+1-Round
  • Cartridge: 5.56 mm NATO
  • Finish: Black
  • Front Sight: Flip Up
  • Length: 28.25″-29.75″
  • Magazine Included: 1 x 30-Round
  • Magazine Type: Removable
  • Muzzle: Flash Hider
  • Rear Sight: Flip Up
  • Stock Material: Polymer
  • Weight: 8 lbs
  • Made in the USA


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Make: Springfield

Model: Hellion Bullpup


The new Hellion™ from Springfield Armory offers a fundamentally distinctive and revolutionary approach to weapons design, helping to revolutionize notions of semi-automatic 5.56mm performance. Featuring a “bullpup” layout where the action is positioned behind the trigger, the Hellion offers an overall length of only 28.25-inches while yet sporting a 16” barrel. The Hellion boasts ambidextrous controls that function in unison with a reversible case ejection mechanism. The result is a 5.56 that blends portability with tremendous performance.


    The Hellion comes with QD mount points on both sides of the 5.56mm bullpup, ensuring you can use the sling of your choice, arranged for use from either side.


    The bullpup system moves the action and the magazine back behind the trigger, reducing the overall length drastically while still retaining effective downrange performance.


    The Hellion 5.56mm bullpup features a two-position adjustable gas block with “S” suppressed and “N” normal modes to adapt to conditions and ammo availability.

Hellion Bullpup Rifle at the Range

I worked with the Hellion rifle at a friend’s range. We filled up the supplied Magpul PMAG 30 first with PMC 55-grain ammunition, reserving some Winchester “White Box” 55-grain ammo for the following round of testing. The first thing I noticed was how quickly the magazine entered and secured in place.

It was a considerable improvement over an AR mag system. Inserting it in firmly did not need a smash. The ambidextrous charging handle ran the bolt back as smooth as silk. The only operational difficulty I experienced was having to modify my grip to use the safety lever. However, my buddy has bigger hands and had no trouble.

The Hellion is one smooth-shooting bullpup rifle. The gas piston working method has none of the abruptness of the AR’s direct impingement system. We fired in a standing stance around 75 feet from the target. The Aimpoint was sighted a touch to the left for both, but the three-shot groups fell in beautiful 2-inch clusters from a standing posture.

Rapid-fire ringing of the steel silhouette was a blast with the Winchester White Box ammunition. There were no faults of any type. The Hellions 1×7 barrel twist rate will shine with bullets of 62 grains and higher in weight. And it should exceed an AR in accuracy because the barrel is not part of an upper receiver that pivots on a hinge pin and locks in place with a captive locking pin. It keeps the Hellion’s barrel rock-solidly in place. Recoil is a mild nudge owing to the low-bore axis.

Hellion Operations and Features

The Hellion employs a short-stroke piston working mechanism that is two-position adjustable. Its ambidextrous non-reciprocating charging handle is positioned above the upper receiver — below the top rail carry handle — and is readily accessible and operated.

The ambidextrous fire-control system is similar of the HK weapons systems and positioned right above the BCM GUNFIGHTER Mod 3 grip. Safe is denoted as a white bullet outline with a “X” in the centre, whereas Fire is represented by a single red bullet outline.

Aft of the pistol grip is the magazine well. The magazine release paddle is positioned at the back of the well. At the back is a five-position polymer stock with cheek riser. An ambidextrous release latch is positioned at the back of the stock.

To operate the two-piece bolt release, squeeze the sliding section to a fixed stop with the thumb and index finger. The bolt release doesn’t lock the bolt back. Inserting an empty magazine first is essential to lock the action open for disassembly.

A frequent criticism among bullpup shooters is of the design’s typically awful trigger pull caused by the lengthy drawbar. The developers at HS have surmounted this and developed a trigger pull that is the greatest I’ve encountered on a bullpup design as well as many regular military rifles. Following roughly a half-inch of take-up, the draw weights in at 6.12 pounds.

The short handguard is a polymer M-LOK with lots of apertures, which assist dissipate heat from the totally enclosed 16-inch CMV, 1:7 Melonite-coated barrel. The flash hider is a four-prong kind.

The integrated adjustable folding sights are the greatest I’ve ever seen. They collapse below the level of the full-length Picatinny rail with a press of the top-mounted button. I installed my beloved Aimpoint Comp 2 Red Dot sight for testing.

Springfield Armory Hellion: Compact Bullpup Delivers Full-Length Power

Partnering with the Croatian guns producer HS Produkt has enabled Springfield Armory to jump into the high-capacity polymer handgun market with the XD series. Continuing with that established excellence, Springfield launched a new bullpup 5.56mm semi-automatic sports rifle. Based on the Croatian military’s full-auto-capable combat rifle, HS VHS-2, the Springfield Hellion will provide American users a lifetime of service.

About the Springfield 5.56mm Hellion Bullpup Rifle

The Hellion provides shooters a 16-inch barrel while keeping the overall length less than that of an M4 carbine. The outcome is full M4 carbine levels of 5.56mm power. One of the easiest ways to grasp the dimensions benefits of the Hellion is to compare the adjustable stock Hellion with the adjustable stock Saint M-LOK AR-15 carbine.

The Saint is an improved M4-style carbine and, like the Hellion, is fitted with a 16-inch barrel. The Hellion is NOT classed as a short-barreled rifle (SBR) (SBR). The Springfield Hellion comes in at 4 to 5.75 inches shorter.

Rifle Springfield Saint Springfield Hellion
Overall Length Stock Closed: 32.5 inches

Open: 35.5 inches

Stock Closed: 28.25 inches

Open: 29.75 inches

Weight 6 pounds, 11 ounces 8 pounds

As side-ejecting weapons, bullpup operation must be almost ambidextrous. The action of a bullpup is positioned near a shooter’s cheek. So if you are left-handed, and your bullpup is set up for right-hand ejection, highly hot, empty cases will be discharged straight into your face or eye.

To rectify this, the Hellion design allows for moving the ejection port function to the left side. With the Hellion partly disassembled, swapping ejection ports involves relocating the bolt carrier group per instructions for right or left side ejection, then shifting the port cover locking pin from the left side to the right to maintain the right cover secured.

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