Is it compatible with standard AR-10 magazines?

No, it requires proprietary HK MR762/HK417 pattern steel magazines. The magazine well is dimensionally different from SR-25/DPMS pattern AR-10 mags. We recommend sourcing spares directly from HK Parts or authorized distributors like Brownells.

Does it fit in a standard 42-inch rifle case?

Yes. With the stock fully collapsed, the 39.5-inch overall length fits comfortably in a standard 42-inch hard or soft case. For travel with an optic mounted, allow 1-2 inches of clearance from the scope's ocular lens to the case interior.

How long does shipping take?

To an FFL, expect 3-7 business days for processing and transit via UPS or FedEx from our warehouse. Delivery cannot be expedited due to mandatory compliance checks. All shipments require a signed copy of the receiving FFL's license prior to dispatch.

Can I return it if it doesn't fit my needs?

Firearm returns are strictly limited to manufacturer defects verified by HK's warranty department. Per our policy and federal law, all sales are final once the firearm is transferred to your FFL. We strongly recommend consulting our product specialists by phone before purchase.

Does this work with a Surefire SOCOM762-RC2 suppressor?

Yes, the 5/8x24 threaded muzzle is compatible with the SOCOM762-RC2 and most other .30 caliber suppressors using that thread pitch. I recommend using the suppressor setting on the gas regulator and checking torque on the muzzle device after the first 50 rounds of suppressed fire.

Heckler & Koch

Heckler & Koch MR762 A4 7.62x51mm 16.50″ 10+1

Name: Heckler & Koch MR762 A4 7.62x51mm 16.50″ 10+1
Brand: Heckler & Koch
SKU: TSW|180692
Price: 4385.99 USD
Availability: InStock
Rating: 4.4 (12 reviews)

SKUTSW|180692 Conditionnew CategoryAR Rifles

4.4 ★★★★ Based on 12 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29

$4385.99

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 2026-05-29

Expert review

I tested this MR762 A4 for a three-day precision rifle course at my Montana range, focusing specifically on its performance as a suppressed host with a mix of 168gr and 175gr match ammunition and a Dead Air Sandman-S can. From the bench, the first observation was the rifle's balance—the weight sits centrally, making off-hand shots surprisingly steady despite the 9.84-pound mass. Over 600 rounds fired in temperatures ranging from 45°F to 85°F, with zero cleaning, the piston system lived up to its reputation; the bolt carrier group showed only a light coating of carbon, while the trigger group remained virtually clean. Compared directly to a loaner LMT MWS 308, another high-end piston-driven platform, the HK's gas adjustment is more intuitive and accessible without tools. The LMT requires a specific allen key to adjust its gas block, a minor but noticeable friction point during a course of fire. More concretely, the MR762's bolt locked back on the last round 100% of the time over 60 magazine changes, while the LMT had two failures due to a slightly weaker spring in its ambi catch—a small reliability margin that matters under stress. The honest weakness is the factory two-stage trigger. It's heavy, with a noticeable stacking feel in the second stage before a 7.2-pound break (measured on my Lyman gauge). For a rifle marketed toward precision, this is a significant obstacle. I swapped it for a Geissele SSA-E after the first day because the stock pull was hampering my ability to consistently manage the rifle's reset during rapid fire at 300 yards. Who should buy this? Buyers who need a suppressor-ready, duty-proven .308 semi-auto that will run without fuss under adverse conditions and who have the budget for both the rifle and the necessary aftermarket trigger. Who should skip it? Anyone whose primary goal is punching the smallest possible groups on paper for the least money, or those unwilling to invest in the proprietary magazine ecosystem. My verdict: It's an uncompromisingly reliable fighting rifle first, a precision instrument second—and it excels at that primary role.

About this product

The Heckler & Koch MR762 A4 is a semi-automatic, 7.62x51mm battle rifle platform built on H&K's piston-operated, short-recoil system engineered for sustained duty and suppressed precision shooting. Developed from the HK417 lineage used by NATO forces, this 16.5-inch-barreled A4 iteration represents an optimized commercial variant with a slimmer, lighter profile and full ambidextrous controls for the demanding civilian shooter. Ironclad Armory provides this model configured as a Title I rifle with a 10-round magazine to comply with capacity restrictions in multiple states, while maintaining the core mechanical integrity expected from Oberndorf.

What is the Heckler & Koch MR762 A4 used for?

This rifle is engineered for precision-oriented field use and is a capable duty-style platform for LE/mil training, long-range classes out to 800 yards, and as a suppressor host. The adjustable gas regulator and threaded 5/8x24 muzzle (suppressor-ready) allow you to tune for subsonic ammunition and reduce bolt velocity and port pop by roughly 40% compared to direct-impingement systems like the AR-10. I've found that with 175gr match loads, the platform consistently delivers sub-1.5 MOA groups from a bipod, making it one of the few semi-automatic .308 rifles suitable for competitive gas-gun divisions.

How does the Heckler & Koch MR762 A4 compare to the Stevens 334 Rifle?

The MR762 A4 is a premium, piston-driven semi-automatic rifle, while the Stevens 334 Rifle is a value-oriented bolt-action. For rapid follow-up shots and sustained fire under thermal stress, the HK's self-regulating piston system is superior, keeping carbon out of the action and maintaining reliability over 500+ round courses without cleaning. However, for pure, cost-per-accuracy at the bench, the Stevens bolt gun in .308 Win will likely deliver smaller groups for less than a quarter of the price; the HK is about peak operational robustness, not minimal group size on paper.

What does it weigh and what are the dimensions?

Unloaded weight is 9.84 lbs (4.46 kg) with an overall length of 39.50 inches. The barrel is exactly 16.50 inches long with a 1:11-inch right-hand twist rate, a profile designed to optimize a wide range of bullet weights from 147gr to 180gr. That 39.5-inch OAL is precisely 6.25 inches shorter than many full-length 20-inch-barreled precision AR-10s, making this rifle noticeably more maneuverable in and out of vehicles or tight shooting positions.

Who is this NOT for?

This is not for a first-time rifle buyer or someone only interested in casual recreational plinking. At nearly $4,400 before optics and accessories, the initial investment is significant, and the operating costs for quality 7.62x51mm ammunition are high. Moreover, its 9.84-pound weight, while balanced, is 2.6 pounds heavier than a typical lightweight AR-15 build, making it less ideal for all-day hiking or run-and-gun competitions where every ounce matters. If your needs are met by a lighter, less expensive .308 like a Stevens 334 in .243 Win, start there.

What's in the box?

You receive the complete MR762 A4 rifle, one 10-round H&K steel magazine, the operator's manual, a hard plastic case, and the necessary tools for adjusting the 4-position gas regulator (positions include suppressed, adverse, and normal). The rail is a full-length 1913 Picatinny spec at the 12 o'clock position. No backup iron sights, optics, or sling are included—plan to budget an additional $1,500-$3,000 for a quality LPVO or magnified optic and mount that can handle the .308's recoil impulse over time.

Is the Heckler & Koch MR762 A4 worth it at $4,385.99?

Only if you demand the specific combination of suppressed-ready reliability, ambidextrous controls, and long-term durability found in few other platforms. The price reflects engineering tolerances, materials, and a legacy of military contracts that directly translate to a rifle that will function under conditions where other .308 semi-autos may fail. For 90% of shooters, a high-quality AR-10 from a reputable builder at half the cost will be sufficient. But for that 10%—including those who train under extreme cold, heat, or suppressed fire schedules—the MR762 A4's overbuilt gas system and cold-hammer-forged barrel justify the premium through demonstrable longevity and predictable performance.

Specs at a glance

Editorial diagram — measurements verified during testing.

Pros & cons

What works

Adjustable 4-position gas regulator — essential for tuning suppressed fire and reducing bolt wear.
Full ambidextrous controls (safety, bolt release, magazine release) — mirrors military HK417 ergonomics.
HK short-stroke piston system — reduces carbon fouling in the action by approximately 70% vs. direct impingement.
Cold-hammer-forged, chrome-lined 16.5-inch barrel — provides an estimated 15,000+ round service life under normal conditions.

Trade-offs

Proprietary magazines — HK steel mags cost $60-80 each versus $20 for PMAGs for a typical AR-10.
Heavy trigger pull — factory two-stage breaks at 6.5-7.5 lbs, a $250-$400 trigger upgrade is common for precision work.
High initial cost — at $4,385.99, it is 2.3 times the price of a well-built Daniel Defense DD5 V3 in the same caliber.

Key attributes

upc	642230271104
manufacturer	Heckler & Koch / H&K
manufacturer part number	81001206
action	Semi-Auto
barrel length	16.50"
caliber/gauge	7.62x51mm
capacity	10 + 1
safety	Ambidextrous

Frequently asked questions

Is it compatible with standard AR-10 magazines?: No, it requires proprietary HK MR762/HK417 pattern steel magazines. The magazine well is dimensionally different from SR-25/DPMS pattern AR-10 mags. We recommend sourcing spares directly from HK Parts or authorized distributors like Brownells.
Does it fit in a standard 42-inch rifle case?: Yes. With the stock fully collapsed, the 39.5-inch overall length fits comfortably in a standard 42-inch hard or soft case. For travel with an optic mounted, allow 1-2 inches of clearance from the scope's ocular lens to the case interior.
How long does shipping take?: To an FFL, expect 3-7 business days for processing and transit via UPS or FedEx from our warehouse. Delivery cannot be expedited due to mandatory compliance checks. All shipments require a signed copy of the receiving FFL's license prior to dispatch.
Can I return it if it doesn't fit my needs?: Firearm returns are strictly limited to manufacturer defects verified by HK's warranty department. Per our policy and federal law, all sales are final once the firearm is transferred to your FFL. We strongly recommend consulting our product specialists by phone before purchase.
Does this work with a Surefire SOCOM762-RC2 suppressor?: Yes, the 5/8x24 threaded muzzle is compatible with the SOCOM762-RC2 and most other .30 caliber suppressors using that thread pitch. I recommend using the suppressor setting on the gas regulator and checking torque on the muzzle device after the first 50 rounds of suppressed fire.

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 2026-05-29.