H&K MR762 A4 7.62x51mm 16.5in Threaded 10rd
Pros & cons
What works
- Adjustable gas system with 4 positions including suppressed setting
- Cold hammer-forged barrel with 20,000 round service life expectancy
- Ambidextrous controls including bolt release and selector
- M-LOK handguard with 21 mounting slots for accessories
Trade-offs
- Proprietary magazines cost $85 each versus $20 for AR-10 pattern
- 9.84 lb weight is 3.34 lbs heavier than comparable DPMS AR-10 rifles
- No iron sights included — requires $200-500 optic investment
- Barrel threading is 5/8x24 only, no adapter included for 1/2x28 devices
Video review
Expert review
Specs at a glance
About this product
What is the H&K MR762 A4 7.62x51mm 16.5in Threaded 10rd rifle? It's Heckler & Koch's civilian-legal semi-automatic platform derived from their HK417 military pattern, built for precision and reliability in 7.62x51mm NATO caliber. This specific configuration features a 16.5-inch threaded barrel with 5/8x24 pattern, adjustable gas piston system, and ships with one 10-round magazine.
What is the H&K MR762 A4 used for?
The MR762 A4 serves as a designated marksman or precision rifle platform for civilian shooters who require NATO-caliber performance at extended ranges. With its 16.5-inch barrel threading at 5/8x24, it maintains muzzle velocity of approximately 2,550 fps with M80 ball ammunition while accommodating suppressors or muzzle devices. The adjustable gas system allows tuning for suppressed operation without sacrificing reliability.
How does the H&K MR762 A4 compare to the Stevens 334 Rifle in .308 Win?
The MR762 A4 delivers semi-automatic capability where the Stevens 334 offers bolt-action precision at less than one-third the price. While the Stevens 334 in .308 Win provides sub-MOA accuracy from its 20-inch barrel for approximately $450, the HK platform offers rapid follow-up shots and modularity at 9.84 lbs unloaded versus the Stevens' 6.5 lbs. For dynamic shooting or multiple target engagements, the HK's gas piston system proves superior; for pure precision shooting from a static position, the Stevens delivers better value.
What does it weigh and what are the dimensions?
The MR762 A4 measures 39.5 inches overall with a 16.5-inch cold hammer-forged barrel and weighs 9.84 pounds unloaded. The barrel features a 1:11 twist rate optimized for 168-175 grain match ammunition, while the 12.5-inch M-LOK handguard provides 21 slots for accessory mounting. At 9.84 lbs, it's 3.34 lbs heavier than an AR-10 platform with similar barrel length.
Who is this NOT for?
This rifle isn't for budget-conscious shooters or those seeking lightweight mountain hunting configurations. At $4,479, the MR762 A4 commands nearly ten times the price of budget bolt-actions like the Stevens 334 while weighing 51% more than comparable AR-10 platforms. The proprietary magazine system also limits aftermarket options compared to DPMS-pattern rifles.
What's in the box?
The rifle ships with one 10-round steel magazine, operator's manual, and HK's limited lifetime warranty documentation. Notably absent are iron sights, cleaning kit, or additional magazines—expect to invest another $300-500 for backup magazines and optics mounting solutions. The threaded barrel includes a protective thread protector but no muzzle device.
Is the H&K MR762 A4 worth it at $4,479?
At $4,479, the MR762 A4 justifies its cost only for shooters requiring military-proven reliability and suppressor-ready operation out of the box. The short-stroke piston system runs cleaner than direct impingement alternatives and the ambidextrous controls accommodate left-handed shooters without modification. For precision shooting on a budget, the Stevens 334 in .308 Win delivers comparable accuracy at $450, but lacks the MR762's rapid-fire capability and modularity.
Key attributes
| upc | 642230269460 |
| manufacturer | Heckler & Koch / H&K |
| manufacturer part number | 81000830 |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel length | 16.50" |
| caliber/gauge | 7.62x51mm |
| capacity | 10 + 1 |
| color | Black |
| length | 44 |
| model | MR762 A4 |
| number of magazines | 1 10 rd. |
| package height | 4.0 |
| package width | 13.1 |
| product type | AR |
| safety | Ambidextrous |
| shipping weight | 14.9 |
| 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 AR-10 magazines?
- No, the MR762 A4 uses proprietary HK steel magazines that are not interchangeable with DPMS-pattern AR-10 magazines. HK magazines feature a reinforced steel construction and cost approximately $85 each versus $20 for polymer AR-10 magazines.
- Does it fit in a standard rifle case?
- Yes, the 39.5-inch overall length fits most 42-inch rifle cases with minimal extra space. For hard cases, look for models with at least 40 inches of interior length to accommodate optics and potential muzzle devices.
- How long does shipping take to Montana?
- Firearms ship via FedEx 2Day with adult signature required, typically arriving within 3-5 business days after FFL verification. All shipments require coordination with your local FFL holder before processing.
- Can I return it if it doesn't cycle properly?
- Ironclad Armory accepts returns within 30 days for manufacturing defects, but firearms must be unfired and in original packaging. For cycling issues, HK's warranty requires direct contact with their service center in Columbus, Georgia.
- Does this work with Surefire suppressors?
- Yes, the 5/8x24 threaded muzzle accepts most .30 caliber suppressors including Surefire SOCOM762-RC2 models. The adjustable gas block has four settings specifically for suppressed operation with high-backpressure cans.