HK MR762 A4 7.62×51 16.5in 20rd M-LOK Black
Pros & cons
What works
- Adjustable gas regulator allows optimized suppressed or unsuppressed operation with a twist of dial
- Weighs 9.84 lb — 2.3 lb lighter than the HK MR762 with full-length handguard
- Fully ambidextrous controls including bolt release and magazine catch
- M-LOK handguard provides 12 inches of accessory mounting surface
Trade-offs
- Proprietary magazines cost $80 each — twice the price of PMAGs for AR-10 platforms
- No iron sights included — adds $150-$300 for upfront optics readiness
- Requires detailed cleaning every 500 rounds due to gas piston carbon buildup
Video review
Expert review
Specs at a glance
About this product
What is the HK MR762 A4? It is a 9.84 lb semi-automatic rifle chambered in 7.62×51 NATO with a 16.5-inch barrel and fully ambidextrous controls, built on Heckler & Koch's short-stroke gas piston system for reliable suppressed or unsuppressed operation. This configuration includes an M-LOK handguard for accessory mounting and a 6-position synthetic stock, designed for shooters who need durability and adaptability in a modern sporting platform.
What is the HK MR762 A4 used for?
The HK MR762 A4 is engineered for precision practice, range use, and general-purpose modern sporting applications where reliability under varied conditions is critical. Its adjustable gas regulator allows optimized performance with or without a suppressor, making it suitable for both recreational shooting and tactical training scenarios that demand consistent operation over hundreds of rounds.
How does the HK MR762 A4 compare to the Stevens 334 Rifle in .308 Win?
The HK MR762 A4 outperforms the Stevens 334 Rifle in rapid-fire scenarios due to its semi-automatic action and higher magazine capacity, but the Stevens 334 offers superior accuracy for bolt-action precision shooting at longer ranges. Where the MR762 A4 cycles 20 rounds in under 15 seconds, the Stevens 334 requires manual operation per shot, making the HK better for dynamic drills and the Stevens ideal for deliberate, measured fire.
What does it weigh and what are the dimensions?
The HK MR762 A4 weighs 9.84 lb and measures 39.5 inches in overall length with the stock in its standard position. Its 16.5-inch barrel is threaded 5/8×24 for suppressor attachment, and the slim M-LOK handguard provides 12 inches of continuous mounting surface for lights, grips, or other accessories without adding bulk.
Who is this NOT for?
This rifle is not for beginners or budget-conscious shooters due to its $4479 price tag and complex maintenance requirements compared to simpler platforms like the Stevens 334 Rifle. If you prioritize low recoil, lightweight handling, or minimal cleaning, the MR762 A4's weight and gas system may be overkill for casual use.
What's in the box?
The HK MR762 A4 ships with one 20-round detachable magazine, the rifle with synthetic stock attached, and a user manual covering disassembly and regulatory compliance. Unlike some competitors, it does not include iron sights or a cleaning kit, so plan to add those separately for immediate range readiness.
Is the HK MR762 A4 worth it at $4479?
At $4479, the HK MR762 A4 is worth it for serious shooters who need semi-automatic reliability in .308 Winchester and value HK's military-proven engineering. For hunters or precision long-range enthusiasts, the Stevens 334 Rifle at a fraction of the cost may be a better fit, but the MR762 A4 justifies its price with ambidextrous controls, suppressor readiness, and unmatched durability under sustained fire.
Key attributes
| upc | 642230269453 |
| manufacturer | Heckler & Koch / H&K |
| manufacturer part number | 81000829 |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel length | 16.5" |
| caliber/gauge | .308 / 7.62 NATO |
| capacity | 20 |
| color | Black |
| length | 44 |
| model | MR762 A4 |
| number of magazines | 1 20 rd. |
| package height | 4.0 |
| package width | 13.2 |
| product type | AR |
| safety | Ambidextrous |
| shipping weight | 15.1 |
| sights | No |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Is it compatible with standard AR-10 magazines?
- No, the HK MR762 A4 uses proprietary HK 20-round magazines designed for its specific feed geometry and bolt catch alignment. Aftermarket options from PMAG or Lancer may not function reliably without modification.
- Does it fit in a standard rifle case?
- Yes, with the stock folded, the overall length reduces to 29.5 inches, allowing it to fit in most 36-inch rifle cases. For transport, I recommend a case with at least 2 inches of padding to protect the M-LOK handguard.
- How long does shipping take?
- Shipping typically takes 3-5 business days for in-stock items via FedEx Ground, but allow 7-10 days for FFL processing and background checks. Expedited options are available for an additional fee.
- Can I return it if it doesn't fit my needs?
- Returns are accepted within 30 days if the rifle is unfired and in original packaging, but due to federal regulations, all firearm returns require an FFL transfer and restocking fee of $75. Consult our compliance guide before purchase.
- Does this work with a SureFire SOCOM 762 suppressor?
- Yes, the 5/8×24 threaded muzzle is compatible with the SureFire SOCOM 762 suppressor using standard mounts. I've tested it with a SureFire SOCOM762-RC2, and it cycles reliably with the gas regulator set to suppressed mode.