HK MR762 A4 Pistol 7.62x51mm 13″

About this product

What is the HK MR762 A4 Pistol 7.62x51mm 13″? It’s a purpose-built, Title II-regulated firearm configured from the factory as a 13-inch barreled pistol, delivering the mechanical reliability of Heckler & Koch’s battle-proven short-stroke gas piston system in a compact, suppressor-ready format. Built on the commercial MR762 platform, it is not an aftermarket conversion but a factory-original configuration using an HK medium-contour cold-hammer-forged barrel and fully ambidextrous lower receiver. This distinction matters for both performance consistency and regulatory compliance, as it avoids the legal gray areas of post-manufacture modifications.

What is the HK MR762 A4 Pistol used for?

This pistol is engineered for precision-oriented application where a standard 16-inch rifle would be cumbersome, specifically as a dedicated host for a sound suppressor or for vehicle-based or confined-space use. Its 13-inch barrel, combined with the 1-in-11-inch twist rate, is optimized to stabilize heavy, subsonic 7.62x51mm ammunition for suppressed shooting, trading approximately 150-200 feet per second of muzzle velocity from a full 16-inch barrel for drastic reductions in overall length. The adjustable gas block allows you to tune the system for reliable cycling with a wide variety of loads, from standard 147-grain ball to 208-grain subsonic rounds, making it a practical tool for advanced training, tactical courses, and as a compact defensive firearm where legal.

How does the HK MR762 A4 Pistol compare to the Stevens 334 Rifle?

The HK MR762A4 pistol offers a fundamentally different operating mechanism and use case than a bolt-action like the Stevens 334 Rifle in .308 Win, trading long-range precision for rapid follow-up shot capability. While the Stevens 334 is better for deliberate, unsupported shooting at distances beyond 500 yards due to its locked-breech bolt action and likely superior inherent accuracy potential, the HK's semi-automatic, piston-driven action is superior for managing recoil during rapid strings of fire and for use in dynamic scenarios where speed is critical. The HK also provides a modern, modular mounting platform for optics and accessories that the traditional Stevens rifle lacks.

What does it weigh and what are the dimensions?

Unloaded, the MR762 A4 pistol weighs 7.95 pounds and measures 31.4 inches in overall length. The barrel itself is 13.0 inches long with a 5/8x24 threaded muzzle, and the handguard provides 11.5 inches of continuous M-LOK attachment surface. For context, adding a common suppressor like a Surefire SOCOM762-RC2, which is 7.9 inches long, would increase the overall length to just over 39 inches and add approximately 1.5 pounds, bringing the total ready weight to nearly 9.5 pounds before optics or ammunition.

Who is this NOT for?

This is not for a first-time rifle purchaser, a budget-conscious plinker, or someone unfamiliar with the National Firearms Act. At a $4,479 price point, it demands a significant investment before adding an optic, suppressor, and NFA tax stamp. It is also a poor choice for hunters restricted to straight-walled cartridges or for those seeking a lightweight backpacking rifle, as its 7.95-pound weight is substantial for its size. If your primary need is inexpensive, high-volume range time with .308 Winchester, a platform like an AR-10 from PSA or Aero Precision will offer similar functionality at less than half the cost.

What's in the box?

You receive the complete MR762 A4 pistol, one 20-round HK steel magazine, a basic operator's manual, and a factory test target. Notably absent are any iron sights, a sling, or a case, which are typical exclusions at this price point for duty-grade firearms. You will need to budget an additional $200-$400 immediately for a quality red dot or low-power variable optic to make the platform usable, and a robust two-point sling is a mandatory add-on for safe handling.

Is the HK MR762 A4 Pistol worth it at $4479?

Yes, but only for a shooter who specifically requires the uncompromising reliability of HK's sealed piston system in a compact, suppressor-optimized package and understands the associated NFA compliance requirements. You are paying for a factory-original, fully-warranted configuration with legendary durability—the same short-stroke piston system found in military HK417 rifles—not just for a shortened barrel. For the shooter who needs that specific pedigree and intends to run it hard with a can, the cost is justified. For everyone else, a Stevens 555 Sporting O/U and a case of shells would provide more practical enjoyment for a fraction of the price.