HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous
$4,911.75
The HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard delivers HK’s legendary piston reliability in a slim, ambidextrous package. Perfect for long-range shooting, competition, or home defense.
The HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous is the latest evolution of HK’s no-compromise precision rifle platform. This rifle uses a short stroke gas piston system that keeps carbon fouling out of the action, so it runs cleaner and longer between cleanings. The adjustable gas regulator lets you tune the action for suppressed or unsuppressed use, and the fully ambidextrous controls make it easier for left- and right-handed shooters alike.
| Manufacturer | Heckler & Koch |
|---|---|
| Model | MR762 A4 |
| Material | 7075-T6 aluminum receiver, steel barrel, synthetic stock |
| Compatibility | 7.62x51mm NATO / .308 Winchester |
| Finish | Patriot Brown anodized receiver, black synthetic stock and grip |
| Weight | 8.6 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Short Stroke Gas Piston System — WHY IT MATTERS: This system keeps hot carbon and fouling out of the action, so your rifle stays reliable longer and requires less frequent cleaning. It also reduces heat transfer to the bolt carrier group, extending part life.
- Adjustable Gas Regulator — WHY IT MATTERS: You can tune the action specifically for suppressed or unsuppressed fire. This means consistent cycling and less wear on internal parts, whether you’re running a can or shooting bare muzzle.
- Fully Ambidextrous Controls — WHY IT MATTERS: Left-handed shooters get the same ease of use as right-handed shooters. The ambi safety selector, bolt release, and magazine release let you operate the rifle naturally from either shoulder.
- Slim M-LOK Handguard — WHY IT MATTERS: The handguard is slimmer than previous generations, giving you a more comfortable grip and better control. M-LOK slots let you attach lights, lasers, or bipods without adding bulk.
- Patriot Brown Picatinny Rail Receiver — WHY IT MATTERS: The full-length Picatinny rail on top gives you plenty of real estate for mounting optics, night vision, or iron sights. The Patriot Brown finish is durable and reduces glare.
Who It’s For
This HK MR762 A4 is built for the serious shooter who wants a precision rifle that can also serve as a duty or home defense tool. It’s ideal for competitive shooters in long-range matches, hunters who need a reliable .308 platform, and anyone who values HK’s engineering and reliability. The ambidextrous controls make it a great choice for left-handed shooters or families where multiple shooters share the rifle.
Pros & Cons
Pros: Legendary HK reliability; clean-running piston system; adjustable gas for suppressor use; fully ambidextrous; slim handgun grip and stock; 20+1 round capacity.
Cons: Higher price point than many AR-10 platforms; limited aftermarket parts compared to standard AR-15s; threaded barrel comes without a muzzle device (you’ll want to add your own brake or suppressor mount).
Comparison vs. Competitors
| Feature | HK MR762 A4 | Geissele Super Duty 308 | Lone Wolf Distributors AR-10 |
|---|---|---|---|
| Operating System | Short stroke gas piston | Direct impingement | Direct impingement |
| Barrel Length | 16.5″ | 16″ | 16″ |
| Weight | 8.6 lbs | 8.2 lbs | 7.9 lbs |
| Ambidextrous Controls | Full ambi (selector, bolt release, mag release) | Ambi selector only | Ambi selector only |
| Gas Adjustment | Yes (suppressed/unsuppressed) | No | No |
| Price | $4,385.49 | $2,800 | $1,500 |
FAQ
What caliber does the HK 81001205 MR762 A4 use?
It fires 7.62x51mm NATO and .308 Winchester ammunition. The 20+1 capacity gives you plenty of firepower for matches or duty use.
Is the barrel threaded and what is the thread pitch?
Yes, the barrel is threaded. According to HK specs, the thread pitch is 5/8″-24, which is standard for .308/7.62 muzzle devices and suppressors.
Can this rifle be used with a suppressor?
Absolutely. The adjustable gas regulator lets you tune the action for suppressed operation. Just install a compatible muzzle brake or flash hider with the correct thread pitch.
Is the rifle fully ambidextrous?
Yes, the MR762 A4 has an ambidextrous safety selector, bolt release, and magazine release. Left-handed shooters will find it just as easy to operate as right-handed shooters.
What kind of warranty does HK offer?
Heckler & Koch provides a limited lifetime warranty on their firearms. Always check the latest warranty terms with HK directly.
✅ Nationwide delivery (all 50 states) — ✅ Ships 1-2 business days — ✅ 30-day returns — ✅ Secure checkout
Browse more AR Rifles or check our Heckler & Koch collection. For precision .308 platforms, see our .308 Rifles.
Last updated: April 2026
FFL Transfer & Firearms Laws for HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous
All firearms, including the HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
Frequently Asked Questions About This Product
Why buy HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: AR Rifles.
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Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
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FFL Transfer & Firearms Laws
All firearms, including the HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the HK 81001205 MR762 A4 7.62x51mm 20+1 16.50″ Black Threaded Barrel, Patriot Brown Picatinny Rail Receiver, M-LOK Handguard, 6 Position Black Synthetic Stock, Black Finger Grooved Grip, Ambidextrous is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
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