Description
The MR762 A4 Pistol is what happens when HK takes the civilian version of the HK417 and shrinks it down to a 13-inch package without cutting a single corner. Chambered in 7.62x51mm NATO, this is a serious amount of horsepower in a platform that measures just 31.4 inches overall. At the heart of it is HK's short-stroke gas piston system, which vents fouling out through the front gas block instead of dumping it back into the receiver. The result is an action that runs cleaner and cooler than a direct impingement gun, round after round, with far less scrubbing at the end of a range day.
A Barrel Built the HK Way
The 13-inch cold hammer forged barrel is cut from HK's cannon grade steel and wears a 1:11 twist that stabilizes a wide range of .308 and 7.62 NATO loads. The muzzle is threaded 5/8×24, so mounting a suppressor or your favorite brake is straightforward. And here is the part suppressor owners will appreciate: the A4 gas system is two-position adjustable, marked N for normal and S for suppressed. Flip it to S with a can attached and you get proper cycling with noticeably less gas coming back at your face.
MR762 A4 Ergonomics and Controls
HK built the A4 lower fully ambidextrous, with the safety lever, magazine release, and bolt catch mirrored on both sides, so lefties get the same experience as everyone else. The free-float M-LOK handguard gives you plenty of room for lights, lasers, and hand stops, while the full-length Picatinny top rail is ready for whatever optic you want to run. It ships without sights, which makes sense on a gun like this, since most buyers are going straight to an LPVO or red dot anyway. HK416-style slimline furniture and the enhanced ergonomic grip round out a package that handles better than its 7.95-pound weight suggests.
Why the MR762 A4 Pistol Earns Its Keep
This is not an entry-level AR-10 pattern gun, and it does not pretend to be. It is a precision-built 7.62 platform from one of the most respected names in the business, sized for tight spaces and ready for a suppressor from the factory. Each one ships with a 20-round magazine, giving you 20+1 on tap right out of the box.
Key Specifications
- Manufacturer: Heckler & Koch
- Model: MR762 A4 Pistol
- MPN: 81001052
- UPC: 642230272484
- Caliber: 7.62x51mm NATO / .308 Win
- Action: Semi-Auto, Short-Stroke Gas Piston
- Barrel Length: 13" Cold Hammer Forged, Threaded
- Thread Pattern: 5/8×24
- Twist Rate: 1:11
- Capacity: 20+1
- Overall Length: 31.4"
- Weight: 7.95 lbs (unloaded)
- Gas System: Two-Position Adjustable (Normal / Suppressed)
- Controls: Fully Ambidextrous Safety, Mag Release, Bolt Catch
- Handguard: Free-Float M-LOK
- Sights: None, Optics-Ready Picatinny Top Rail
What’s Included
- HK MR762 A4 Pistol
- One 20-round magazine
- Owner's manual
Frequently Asked Questions
Does the HK MR762 A4 Pistol come with sights?
No, it ships without sights. The full-length Picatinny top rail is ready for whatever you prefer, whether that is a red dot, an LPVO, or a set of backup irons. Given the price point and purpose of this gun, most owners mount quality glass right away.
Is the MR762 A4 suppressor ready?
Very much so. The 13-inch barrel is threaded 5/8×24, which is the standard pitch for .30 caliber suppressors and muzzle devices. On top of that, the gas system has two settings, N for normal and S for suppressed, so you can tune the gun to cycle properly and cut down on gas blowback when running a can.
How is the MR762 A4 different from a standard direct impingement AR-10?
The MR762 A4 uses HK's short-stroke gas piston system, which pushes fouling and hot gas out through the front gas block rather than back into the receiver. That means a cleaner, cooler-running action and less frequent deep cleaning. It is the same basic operating system found in the HK417 that this gun descends from.
What magazines does the HK MR762 A4 use?
It ships with one 20-round HK polymer magazine for 20+1 total capacity. Factory HK MR762 magazines are the sure bet for spares, and the platform shares magazine compatibility with the broader MR762 family.




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