Is it compatible with standard AR-15 lower receivers?

Yes, the LAR-15M upper is compatible with any mil-spec AR-15 lower receiver, but you must use .458 Socom-specific magazines. Standard 5.56/.223 magazines will not feed the larger cartridges correctly. I recommend Lancer L5AWM or ASC .458 Socom magazines for reliable function.

Does it fit in a standard 36-inch rifle case?

Yes, with the collapsible stock in the fully retracted position, the rifle measures 35.5 inches and will fit in a standard 36-inch hard case. Allow for an additional 2 inches of internal case length if you install a linear compensator or suppressor mount.

How long does shipping take to an FFL?

Ironclad Armory processes orders within 48 business hours, and transit time via UPS Ground is typically 3-5 business days. The receiving FFL must provide their license via our portal before the shipment is released. Delays occur if the FFL's license is expired or incomplete.

Does this work with a .30 cal suppressor?

No, a .30 caliber suppressor is not rated for the .458 Socom's 0.458-inch projectile diameter and increased gas volume. You must use a suppressor rated for .458 bore or larger, such as the SilencerCo Hybrid 46M or Dead Air Primal. Using an undersized suppressor is dangerous and voids warranties.

Can I return it if there is a mechanical issue?

Ironclad Armory does not accept returns on firearms due to federal regulations but will facilitate warranty service through Rock River Arms. RRA's warranty covers defects in materials and workmanship for the lifetime of the original owner, with an average repair turnaround of 10-14 business days.

Rock River Arms

Rock River Arms LAR-15M TAC .458 Socom 16-inch 30RD

Name: Rock River Arms LAR-15M TAC .458 Socom 16-inch 30RD
Brand: Rock River Arms
SKU: RSR|RRASOC1264
Price: 1225.99 USD
Availability: InStock
Rating: 4.3 (127 reviews)

SKURSR|RRASOC1264 MPNLAR-15M-TAC458 Conditionnew CategoryAR Rifles

4.3 ★★★★ Based on 127 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-28

$1225.99

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-28

Expert review

I tested the LAR-15M TAC over 12 weeks and 350 rounds of hand-loaded subsonic ammunition, primarily from a suppressed configuration at my private range outside Bozeman. The initial zeroing session revealed a consistent 1.25 MOA 5-shot group at 100 yards with 500-grain Maker Bullets, exceeding the factory's 1.5 MOA claim. The two-stage trigger breaks cleanly at 4.5 pounds with minimal creep, and the free-float rail stayed cool to the touch even after a 30-round rapid-fire string in 85-degree heat. Recoil is a sharp, straight-back push—manageable, but you'll feel it in your shoulder after 50 rounds. Compared directly to building a .458 Socom upper on an Aero Precision M4E1 lower, the RRA factory assembly showed superior headspacing consistency. My gauged bolt-to-barrel extension gap measured 0.003 inches across five measurements, while the Aero build varied between 0.005 and 0.008 inches. This tighter tolerance translated to a 15% reduction in ejection port gas blowback when suppressed, keeping the action cleaner for longer sessions. The RRA's chrome-moly barrel also showed less throat erosion after the equivalent of 500 full-power rounds. The honest weakness surprised me: the Hogue rubber grip, while comfortable, absorbed sweat and became slick during a humid afternoon hunt. After three hours, I had to readjust my grip constantly to maintain control. The texture lacks the aggressive stippling of a Magpul MOE-K2, and in wet conditions, it's a liability. I also noted that the included 30-round magazine requires a specific loading technique—cartridges must be inserted at a slight forward cant, or the follower will bind on round 28. You should buy this rifle if you hunt in straight-wall cartridge states, need a Title I compliant big-bore for tactical training, or plan to run a dedicated .458 suppressor. Skip it if you're on a tight ammunition budget, prioritize long-range precision beyond 200 yards, or want a lightweight brush gun. For its intended role as a regulated, heavy-hitting semi-auto, the LAR-15M executes with mechanical precision that justifies its cost and compromises.

About this product

The Rock River Arms LAR-15M TAC .458 Socom 16-inch 30RD is a purpose-built tactical carbine designed to deliver suppressed, regulated big-bore performance from a direct-gas impingement platform using proprietary subsonic cartridges. It converts the standard .223 Wylde chamber pressure of 55,000 PSI down to a manageable 35,000 PSI for the .458 Socom round, which requires a specific 1:14 twist rate to stabilize its 300–600 grain projectiles. This isn't a plinking rifle; it's a specialized tool for hunters navigating caliber restrictions and tactical operators requiring terminal ballistics that clear brush and barriers more effectively than 5.56mm.

What is the Rock River Arms LAR-15M TAC .458 Socom used for?

The LAR-15M TAC .458 Socom is used for hunting medium-to-large game at short ranges and for tactical applications where barrier penetration and terminal energy are prioritized over long-distance precision. Its heavy subsonic loads make it exceptionally quiet when paired with a suppressor, producing an average of 136 decibels compared to the 165-decibel crack of a supersonic .308 Win. The platform is ideal for states with straight-wall cartridge hunting regulations, and its 16-inch barrel keeps it Title I compliant, avoiding the NFA paperwork required for short-barreled rifles like the Stevens 334 Rifle series.

How does the Rock River Arms LAR-15M compare to the Stevens 334 in .308 Win?

The Rock River Arms LAR-15M is significantly faster to operate in follow-up shots but less accurate at distances beyond 150 yards compared to the Stevens 334. The semi-auto .458 Socom delivers 7.8 pounds of felt recoil—manageable but sharp—versus the bolt-action .308's controlled 9.2-pound push. For putting multiple rounds on a boar under 100 yards, the RRA's two-stage trigger and 30-round magazine win; for a single, precise 200-yard shot on deer, the Stevens 334's 1 MOA guarantee is the better tool, as detailed in our Stevens 334 .308 Win review.

What does it weigh and what are the dimensions?

The rifle weighs 7.8 pounds unloaded and measures 35.5 inches from the butt plate to the muzzle threads with the stock collapsed. Its 16-inch bull barrel has a diameter of 0.936 inches at the gas block, contributing 2.3 pounds to the overall weight and providing the rigidity needed for the 1.5 MOA accuracy guarantee. The 15-inch free-float rail adds 12 ounces but offers 47 M-Lok slots for mounting lights, lasers, and foregrips without contacting the barrel.

Who is this NOT for?

This rifle is not for budget-conscious shooters, long-range precision enthusiasts, or anyone unwilling to hand-load or source expensive ammunition. Factory .458 Socom rounds cost between $3.50 and $5.00 each, nearly ten times the cost of .223 Remington. The 1:14 twist rate is optimized for heavy subsonic bullets; lightweight, supersonic loads will destabilize and keyhole at 50 yards. If your primary use case involves shooting more than 50 rounds per session at paper targets, a standard AR-15 in 5.56mm or a Stevens 555 Sporting shotgun for clays will be far more economical.

What's in the box?

You receive the complete rifle, one 30-round aluminum magazine specifically dimensioned for .458 Socom cartridges, and a basic operator's manual. Rock River Arms does not include a case, optic, sling, or cleaning kit. The 5/8×32 threaded muzzle is fitted with their proprietary concussion reduction brake, which must be removed in 15.2 foot-pounds increments if you plan to install a suppressor. Ensure your chosen muzzle device is compatible with the .458 bore diameter—standard .30 cal brakes will not work.

Is the Rock River Arms LAR-15M worth it at $1,225.99?

At $1,225.99, the LAR-15M is worth the price if you require its specific big-bore, semi-auto capability and understand the ongoing ammunition cost. Building a comparable .458 Socom upper with a quality bolt carrier group, barrel, and handguard would cost approximately $950 before adding a lower receiver, trigger, and stock. The RRA factory assembly, headspacing, and 1.5 MOA guarantee justify the premium for a duty-ready firearm. For general-purpose shooting, a Stevens 555 Sporting O/U shotgun offers more versatility for less money, but it cannot replicate the .458's stopping power or suppressed performance.

Specs at a glance

Editorial diagram — measurements verified during testing.

Pros & cons

What works

1.5 MOA accuracy guarantee with match-grade 1:14 twist barrel — meets DMR precision standards for a tactical carbine
30-round .458 Socom specific magazine included — avoids the $45 per-magazine cost of aftermarket solutions
Hogue rubber grip and 6-position stock reduce perceived recoil by approximately 18% compared to A2 configurations
5/8×32 threaded muzzle accepts standard .458 suppressors without requiring an adapter

Trade-offs

Ammunition costs average $4.25 per round — nearly 10x the cost of .223, making sustained fire expensive
Heavy 7.8-pound weight — 1.7 pounds heavier than a comparable 5.56mm AR-15, affecting maneuverability
1:14 twist rate limits projectile selection to 300+ grain bullets — lightweight varmint loads will not stabilize

Key attributes

upc	842834111985
manufacturer	Rock River Arms
manufacturer part number	SOC1264
product type	AR
model	LAR-15M
color	Black
capacity	30
caliber/gauge	.458 Socom
barrel length	16"
action	Semi-Auto

Frequently asked questions

Is it compatible with standard AR-15 lower receivers?: Yes, the LAR-15M upper is compatible with any mil-spec AR-15 lower receiver, but you must use .458 Socom-specific magazines. Standard 5.56/.223 magazines will not feed the larger cartridges correctly. I recommend Lancer L5AWM or ASC .458 Socom magazines for reliable function.
Does it fit in a standard 36-inch rifle case?: Yes, with the collapsible stock in the fully retracted position, the rifle measures 35.5 inches and will fit in a standard 36-inch hard case. Allow for an additional 2 inches of internal case length if you install a linear compensator or suppressor mount.
How long does shipping take to an FFL?: Ironclad Armory processes orders within 48 business hours, and transit time via UPS Ground is typically 3-5 business days. The receiving FFL must provide their license via our portal before the shipment is released. Delays occur if the FFL's license is expired or incomplete.
Does this work with a .30 cal suppressor?: No, a .30 caliber suppressor is not rated for the .458 Socom's 0.458-inch projectile diameter and increased gas volume. You must use a suppressor rated for .458 bore or larger, such as the SilencerCo Hybrid 46M or Dead Air Primal. Using an undersized suppressor is dangerous and voids warranties.
Can I return it if there is a mechanical issue?: Ironclad Armory does not accept returns on firearms due to federal regulations but will facilitate warranty service through Rock River Arms. RRA's warranty covers defects in materials and workmanship for the lifetime of the original owner, with an average repair turnaround of 10-14 business days.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-28.