Springfield Hellion Accessories: 8 Bullpup Upgrades Ranked

The Hellion ships with two real factory complaints: the trigger is heavy with long post-wall travel, and the length-of-pull is uncomfortable for shorter shooters or anyone running armor. Everything else is acceptable stock. Most owners spend their first $500 on accessories and stop, because beyond the trigger and LOP fixes the rifle is genuinely close to finished out of the box. The phased buy order below covers everything a Hellion owner needs (mags, optic, sling); the ranked product cards further down cover only the eight Hellion-specific aftermarket parts.

Most Hellion owners buy mags and the bolt release first, then add the buttpad once they realize the factory LOP is too long. The Black Talon trigger work is the largest quality-of-life jump on the platform but means the rifle is down 7-10 days, so most owners batch it with the optic purchase to use the downtime for mounting and zeroing. Skip the trigger work only if the rifle is purely home-defense inside 50 yards, where the factory pull is acceptable.

Magazines are the cheapest do-it-first Hellion upgrade and the first thing you should buy after the rifle itself. The US-market Springfield Hellion is engineered around STANAG AR-15 magazines (a deliberate design change from the original Croatian VHS-2, which used FAMAS and G36 mags), so any quality AR-15 magazine works. The factory ships with one Magpul PMAG 30 Gen M3, which is also the cheapest reliable mag for the platform at around $16 at OpticsPlanet.

For mag count, plan around your use case. EDC or home defense needs three to four loaded mags. Range and training runs burn through magazines fast on a bullpup that handles AR-style high-rate-of-fire drills well; six to eight is the right number once you start running magazine changes as part of training. Duty or suppressor-host roles want six to ten mags ready to go, rotated to keep springs fresh. The Hellion has no proprietary magazine constraint and no aftermarket mag conversion, because it already accepts the entire AR-15 STANAG ecosystem.

Compatibility note: the Hellion accepts Magpul PMAG Gen M3 with full reliability, plus Lancer L5AWM, Daniel Defense polymer mags, and most quality steel and aluminum STANAG mags. Older PMAG Gen M2 magazines work but Gen M3 is the default for new purchases. For background on AR-15 magazine selection and feeding reliability across STANAG mag designs, see our best AR-15 magazines guide and the 5.56 ammo selection guide for the ammo side of the equation.

The factory Hellion stock is a five-position adjustable unit with a height-adjustable cheek riser. It works, but two complaints are common: the longest length-of-pull position (14.4 inches) is uncomfortable for shorter shooters or armor wearers, and the polymer construction develops play after heavy use. The two upgrades below target both issues from different angles.

The Manticore Arms Hellion Curved Buttpad ($160) is the better choice for owners who like the factory adjustable stock and just want a 1-inch shorter LOP plus a curved profile that locks into the shoulder. The Stinc USA Springfield Hellion Low Profile Stock ($39.99) is the better choice for owners who want maximum bulk reduction and a fixed-LOP setup; it removes the entire factory adjustable mechanism in favor of a slim SLS-printed nylon stock. Either change is a clear improvement on the factory unit; the choice comes down to whether you value LOP adjustability or bulk reduction.

The Springfield Hellion ships with a full-length Picatinny top rail, so any standard mount works. The factory cheek riser accommodates both red dots and LPVOs at low and medium mount heights without modification. For close-range home defense and CQB on the 16 inch carbine, the Holosun AEMS Core X2 ($350) is the consensus value pick: enclosed emitter, multi-reticle, solar failsafe, and a 50,000-hour battery life. For shooters who want premium reliability, the Aimpoint Micro T-2 ($849) is the best red dot you can mount on the platform.

For mid-range duty or general-purpose work on the 18 inch and 20 inch variants, an LPVO is more versatile. The Vortex Strike Eagle 1-8x24 FFP ($380) delivers true 1x at low power and 8x for engagements out to 500 yards; it's the consensus value LPVO. The EOTech Vudu 1-6x24 ($1,200) is the premium upgrade with daylight-bright illumination and razor-sharp glass. Whatever you mount, anchor it to a quality QD mount because the Hellion sees enough recoil pulse from the bullpup geometry that screw-mount optics work loose faster than on AR-15s. For a deeper LPVO breakdown across price tiers, see our best LPVO guide and the best AR-15 red dot guide for the close-range option.

The Hellion's factory M-LOK pattern is recessed and tapered, which complicates weapon-light mounting because the slots are not parallel to each other. The Streamlight ProTac HL-X ($119) is the consensus value pick because it ships with both Picatinny and M-LOK mounts; install it on the 3 o'clock or 9 o'clock M-LOK slot and use the Picatinny mount as a backup if the light cants. For shooters running the VHS-2 Project M-LOK Rail ($135), any AR-15 weapon light works cleanly without shimming. The SureFire M600DF ($380) is the premium upgrade with 1,500 lumens and SureFire build quality; the Modlite PLHv2-18650 ($350) is the competition-tier option with the cleanest beam profile in the segment.

For slings, the Hellion ships with six anti-rotation QD sling cups and four hook locations across the handguard, receiver, and stock, which means almost any quality two-point sling works without an adapter. The Magpul MS4 Gen 2 ($60) is the most popular pick for its rapid-adjust slider and dual-mode (one-point or two-point) configuration. Mount the front QD on the handguard's 3 o'clock or 9 o'clock cup and the rear on the stock's QD cup for a balanced two-point. For more sling options including the Vickers Combat Applications Sling and BFG Vickers 2-Point, see our best AR-15 slings guide.