HK MR762 A4 Pistol 7.62x51mm 13″
The HK MR762 A4 pistol 7.62x51mm 13″ is a compact, hard-hitting semi-auto pistol from Heckler & Koch. Built on the proven MR762 platform, it uses a 13-inch cold-hammer-forged barrel and short-stroke gas piston system for reliable, accurate fire in a handy package. Fully ambidextrous controls and a continuous Picatinny rail make it ready for any shooter.
Specifications
| Manufacturer | Heckler & Koch |
|---|---|
| Model | MR762 A4 Pistol |
| Material | Aluminum upper & lower receiver, steel barrel |
| Compatibility | 7.62x51mm NATO / .308 Winchester |
| Finish | Black anodized |
| Weight | 7.95 lb (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 13-inch Cold-Hammer-Forged Barrel – Why it matters: This match-grade barrel delivers exceptional accuracy shot after shot, even under rapid fire, and the medium contour keeps weight manageable for a 7.62mm pistol.
- Short-Stroke Gas Piston System – Why it matters: Keeps carbon and fouling out of the action, reducing cleaning time and increasing reliability with a wide range of ammunition. Great for training new shooters.
- Fully Ambidextrous Controls – Why it matters: Left- or right-handed shooters can operate the safety, bolt release, and magazine release without changing grip. Perfect for teaching the whole family.
- Continuous Picatinny Rail on Upper Receiver – Why it matters: Mount optics, red dots, or magnifiers without adapter plates, giving you a rock-solid zero every time.
- 5/8×24 Threaded Muzzle – Why it matters: Accepts standard 7.62mm muzzle brakes, flash hiders, or suppressors. Makes it easy to tune recoil or go quiet for range sessions.
Who It’s For
This pistol is built for experienced shooters who want a compact, powerful platform for home defense, tactical training, or competition. It also works great as a teaching tool for responsible adults learning to handle a 7.62mm AR-style pistol. The ambidextrous controls and reliable piston system reduce frustration for beginners.
Pros & Cons
- Pro: Legendary HK reliability – the short-stroke piston is proven in military use worldwide.
- Pro: Accurate right out of the box – the cold-hammer-forged barrel keeps groups tight at 100 yards.
- Pro: Full ambidextrous design makes it easy for lefties and righties alike.
- Con: Price point is high compared to budget AR pistols – this is a premium investment for serious shooters.
- Con: Weight at 7.95 lb unloaded is heavier than some 5.56mm pistols, but the 7.62mm cartridge demands a robust build.
Comparison
| Feature | HK MR762 A4 Pistol | Geissele Super Duty Pistol 7.62 | Lone Wolf Distributors GTM-9 7.62 |
|---|---|---|---|
| Barrel Length | 13″ | 12.5″ | 10.5″ |
| Operating System | Short-stroke gas piston | Direct impingement | Direct impingement |
| Weight (unloaded) | 7.95 lb | 7.2 lb | 6.8 lb |
| MSRP | $4,479 | $2,899 | $1,499 |
| Ambidextrous Controls | Yes (full) | Yes (partial) | No |
| Threaded Muzzle | 5/8×24 | 5/8×24 | 5/8×24 |
Frequently Asked Questions
Is the HK MR762 A4 pistol legal in my state?
Firearm laws vary by state and locality. We recommend checking your local regulations before ordering. This pistol is classified as a pistol with a 13-inch barrel, so it may be restricted in some areas. We ship to all 50 states where legal.
Can I use .308 Winchester ammunition in this pistol?
Yes, the HK MR762 A4 is chambered in 7.62x51mm NATO and is safe to fire with .308 Winchester ammunition. Always follow the manufacturer’s safety guidelines and use quality ammunition.
Does this pistol come with a case or accessories?
It ships with one 10-round magazine, a manual, and a hard plastic case. Additional magazines and accessories are sold separately.
What optics fit the Picatinny rail?
Any standard 1913 Picatinny-compatible red dot, holographic sight, or scope can be mounted directly. No adapter plates needed.
How do I clean the piston system?
HK recommends disassembling the piston assembly every 500-1,000 rounds for cleaning. Use a carbon solvent and a brush to remove fouling. The process is simpler than cleaning a direct-impingement gas tube.
✅ Nationwide delivery (all 50 states where legal)
✅ Ships 1-2 business days from order confirmation
✅ 30-day returns on unused, unmodified items
✅ Secure checkout with encrypted payment
Last updated: April 2026
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This HK MR762 A4 Pistol 7.62x51mm 13″ is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
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