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BULLPUPPremium

Springfield Armory

Springfield Hellion 20"

20-inch Hellion rifle with bayonet-lug barrel profile and the compact handling of a bullpup layout.

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Key Highlights

  • •20-inch 5.56 performance
  • •Bullpup overall length
  • •STANAG magazine compatibility

Specifications

Price
$2,078
Weight
8 lb 6 oz
Calibers
5.56x45mm, .223 Rem
Rail Type
mlok
Best For
outdoor defenserange training

Capability Profile

0-10 Scale Across 8 Axes

Compatibility Tags

family: modern-riflefamily: bullpupcaliber: 556mag-type: stanaginterface: picatinny-tophandguard: mlokbarrel: longthread: 1/2x28

Overview

The Springfield Hellion 20-inch rifle is the long-barrel option in the Hellion family. It uses a 20-inch CMV Melonite barrel with a bayonet-lug profile while staying only 32.25 to 33.75 inches overall because the action sits behind the trigger group.

The 20-inch gun is the most natural Hellion for LPVO, magnified optic, and downrange 5.56 roles, but its accessory compatibility remains shared with the 16- and 18-inch variants. Hellion-specific trigger work, bolt releases, buttpads, handguards, stocks, magwell parts, STANAG magazines, lights, slings, and 1/2x28 muzzle devices all follow the same builder path.

Key Features

  • 20-inch CMV Melonite barrel with bayonet lug, 1:7 twist
  • Full-length Picatinny top rail with integrated flip-up sights
  • Polymer M-LOK handguard
  • Feeds from STANAG AR-15 magazines
  • Reversible ejection without extra parts or tools
  • 2-position adjustable short-stroke piston system
  • 5-position adjustable stock with cheek riser
  • 1/2x28 threaded muzzle with 4-prong flash hider

Pros

  • +Best velocity and downrange performance in the Hellion line
  • +Still shorter overall than many conventional 16-inch rifles
  • +Shares the same Hellion accessory ecosystem as the shorter variants

Cons

  • −Heaviest and longest Hellion variant
  • −Less ideal for tight indoor handling than the 16-inch model
  • −Factory trigger remains the first major upgrade

Detailed Specifications

caliber
5.56 NATO / .223 Rem
Barrel Length
20 inches
Overall Length
32.25-33.75 inches
weight
8 lbs 6 oz
operatingSystem
2-position adjustable short-stroke piston
barrel
CMV, Melonite, 1:7 twist, bayonet lug
handguard
Polymer M-LOK
Muzzle Device
4-prong flash hider, 1/2x28 threads
magazine
30-round Magpul PMAG Gen M3
msrp
$2,078

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