Review: New Hellion 20” and 18” Variants

By Scott Conditt
Posted in #Guns
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Review: New Hellion 20” and 18” Variants

August 15th, 2023

6:04 runtime

Springfield Armory offered bullpup fans a great new option when they dropped the Hellion in January of 2022. A descendant in design from the VHS-2 rifle that has served in the hands of Croatian Armed Forces around the world, the original 16”-barreled model of the Hellion makes for a 5.56mm that is a mere 28.25” in overall length at its shortest with the five-position buttstock collapsed.

springfield armory 20-inch hellion review
If you like the Hellion, but wished for a longer barrel, Springfield Armory is now offering two new models that may be of interest: one with an 18″ barrel and a second with a 20″ barrel and bayonet lug (shown).

This sleek form factor made it highly maneuverable as a formidable CQB-style firearm while also retaining all of the desirable characteristics of a full-size carbine. This is the primary advantage of a bullpup-pattern firearm with the action located in the buttstock area and behind the trigger.

The Foundation

Now, some may say, “leave good enough alone” when it comes to the development of new designs on tried-and-true platforms that have satisfied the original goals. But if there’s one thing I’ve learned working in this industry for a few decades now, it’s that the firearms community loves options when it comes to their boomsticks.

springfield armory 18-inch hellion review
The new 18″-barreled version of the Hellion offers the same solid foundation of features that made the original gun so popular.

And on that subject, Springfield Armory has done just that for Hellion fans by offering two new variants of the rifle — one with an 18” barrel and another with a 20” tube. And while both options are cool, the latter doubles down on the badassery by literally bringing a knife to the gunfight with a detachable bayonet option. Yes, you read that right. 

Diving right in, let’s start by covering all of the tried-and-true features of the Hellion that have pleased bullpup fans and have remained the same in these two new models from the original 16” version release of the Hellion.

springfield hellion 20-inch bolt release
Ambidextrous controls are one of the hallmarks of the Hellion line. The 18″ and 20″ models continue this tradition. Shown is the ambidextrous bolt release on the 20″ Hellion.

First off, all of the Hellion models are running on a smooth and reliable short-stroke gas piston system. The piston system always runs exceptionally clean in my experience and also helps to ensure low maintenance requirements and longevity when it comes to wear and tear on internal components and barrels.

You also receive a full suite of completely ambidextrous controls, including the safety selector and non-reciprocating charging handle, as well as a reversible ambidextrous option when it comes to the ejection port. The ambi ejection port feature is one that I really thought was neat from the first iteration of the gun, and is adjustable for either right or left-handed ejection without requiring any special tools or extra parts.

[For more information, read How to Reverse the 5.56mm Hellion Bullpup Ejection System here.]

springfield 20-inch hellion pistol grip
Both of the new Hellion rifles use AR-compatible pistol grips. The highly-respected BCM GUNFIGHTER Mod 3 grip is standard.

The Hellion line-up includes a unique five-point adjustable buttstock, which is a nice standout feature when it comes to bullpup designs that usually don’t afford that option. A two-position adjustable gas regulator that features a “normal” and “suppressed” mode selector for those considering suppression is also offered throughout the line.

In addition, all of the models include some truly robust built-in, flip-up iron sights that are integrated right into the top of the Picatinny rail. They do not obscure your view when they are down, and to deploy them you simply engage the spring-loaded buttons to rapidly flip them up and automatically lock them in place. The rear sight peep features multiple distance apertures that you can select depending on what engagement distances you may be shooting.

[Catch the article How Do You Use the Hellion’s Iron Sights here.]

m-lok attachment points on springfield 20-inch hellion
M-Lok compatible attachment points offer a great deal of flexibility for the attachment of a white light or other accessories. QD sockets for slings are also standard on the Hellion.

The bolt lever release is located to the rear of the magazine well and the mag release. Having spent most of my training time on traditional carbines, I am not ashamed to share that this is the one feature difference from my more traditional carbine collection that took me the longest to retrain myself to engage when shooting the Hellion. But once you get a handle on it, smooth operation and engagement just becomes a matter of repetition and training.

Speaking of shooting the Hellion and one of the most enjoyable factors that has not changed between all of the models that are now available? The recoil impulse, or rather the lack thereof, is ridiculously soft when shooting all three models of the gun.

Going Long

Now, to spotlight the differences between the new 18” and 20” models. Beyond the obvious extended lengths of the barrels and negligible weight differences, to be honest, I was happy to see that not much else was altered, simply because it all works.

20 inch barrel on hellion
The longer 20″ barrel provides improved bullet velocity and energy while also allowing for the attachment of a bayonet. Note the ribbed exterior profile and bayonet lug.

The increase in muzzle velocity from the increased length of the barrels is inherently a bonus, without making the firearms significantly less maneuverable. I found the weight difference between the 18” and 20” barely noticeable.

Here are the specs: The 18” barrel model measures in at an overall length of 30.25″ at the shortest and 31.75″ with the buttstock fully extended. It features a CMV, Melonite-coated barrel with a 1:7” twist, and the carbine weighs 8 lbs., 3 oz.

springfield hellion bayonet
Springfield Armory will soon offer a bayonet that mounts to the 20″ Hellion. The bayonet is an excellent knife and tool that comes with a very functional sheath.

The 20” variant features a 20″ CMV barrel with a Melonite coating, and a 1:7” twist. Weight of the carbine is 8 lbs., 6 oz., and it has an overall measurement ranging from 32.25″ to 33.75″. The barrel of the 20” model is unique, however, in that it is ribbed to aid in dissipating heat. Another really cool feature of the 20” gun is that it has an integrated bayonet lug that is true to the original design.

Speaking of the original design, the 20” Hellion is actually configured very closely to the original Croatian VHS-D2, a designated marksman variant of the VHS design. This barrel length and configuration along with the bayonet lug brings the Hellion 20” very close to this really cool VHS variant — apart from its semi-auto-only operation, of course.


Here are the specs on the new Hellion rifles:

Hellion 18″Hellion 20″
Chambering5.56 NATO/.2235.56 NATO/.223
Barrel Length18″20″
Overall Length30.25″ — 31.75″32.25″ — 33.75″
Weight8 lbs 3 oz8 lbs 6 oz
SightsFlip-up irons & Picatinny railFlip-up irons & Picatinny rail
Stock5-position collapsible5-position collapsible
Capacity30 (one magazine included)30 (one magazine included)

Range Time

Shooting at the range was a lot of fun. The bullpup design really makes for a pleasant and soft impulse, which is refreshing. You get a great sense of enhanced control and diminished muzzle rise when shooting this rifle versus most traditional carbines, and if you are an avid AR-15 shooter like myself it’s neat to mix it up with a different flavor.

springfield hellion 20 inch model with bayonet
The Hellion was tested on the range with the mounted bayonet with Remington ammo. Both the 18″ and 20″ guns were completely reliable.

I loaded up a mag full of Remington UMC Centerfire Rifle .223 55-grain ammo and shot steel from 50 yards away using both an Eotech LPVO and EXPS2 Holosight on the Hellions.

[Be sure to read Best LPVO Scopes for the Hellion if you need a good optic for your rifle.]

Straight away, switching between the 18” and 20” back-to-back, I really enjoyed both and they felt very comparable. However, if I had to choose a personal favorite for a fun range session, shooting the 20” variant with a bayonet affixed to the end was a hoot if only for style points.

springfield hellion 18 inch barrel
The 18″ barrel model of the Hellion retains a light weight and compact size while offering a measurable increase in bullet velocity and energy.

The bayonet, which will be available soon on the Springfield Armory Store, easily fit onto the very secure lug, and while firing a few mags though the 20” rifle with it attached, it did not interfere with firing whatsoever. I definitely had to clean some carbon off the bayonet when I took it off, but if you’re not getting your tools dirty it means you aren’t using them.


My key takeaway from these two newly dropped Hellions is that there is truly something for everybody now in this line. If you want an ultra-streamlined and compact bullpup for CQB work, both the 16” and 18” variants are exceptional options, with the 18” offering a bit of increase in muzzle velocity with a minimal increase in size and weight. The 20” also affords the increase in the velocity category, along with the ribbed barrel for more rapid cooldown and the bayonet lug for some sharp accessorizing potential.

If you are looking to pick up a bullpup, the Hellion line gives you a great platform at the heart of each variation, and the choice of barrel length is yours depending on what your use case and style may be.

Regardless of which one you choose to test out or take to the range next, I think you’ll be pleased with the performance no matter the model because one thing is consistent between them all: they’re a hell of a lot of fun to run.

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Springfield Armory® recommends you seek qualified and competent training from a certified instructor prior to handling any firearm and be sure to read your owner’s manual. These articles and videos are considered to be suggestions and not recommendations from Springfield Armory. The views and opinions expressed on this website are those of the authors and do not necessarily reflect the views and opinions of Springfield Armory.

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Scott Conditt

Scott Conditt

Scott Conditt is a husband, father, filmmaker, author, photographer and raconteur based in Phoenix, Arizona. Co-Founder of Offensive Marketing Group, his daily grind consists of playing with badass hardware, dreaming up wild concepts, and conspiring to bring them from script to screen with his team. Guns, gadgets, survival, technology, archery and cutting-edge armor ... these are a few of his favorite things to create content around.

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