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The H&K MR762 A4 Upper Receiver Kit is a complete, factory-built upper and barrel assembly that carries over the same short-stroke piston operating system that made the HK417 a favorite with elite military and law enforcement units. Instead of dumping hot gas and carbon straight back into the action like a direct-impingement AR-10, the piston and pusher rod design keeps that fouling forward of the receiver. The result is a rifle that runs cooler, cleaner, and stays reliable through long strings of fire with less scrubbing between range days.
This is the newest generation of the MR762 upper, and HK reworked several key pieces. It ships with an updated medium-contour barrel profile, an adjustable gas block, and a slimmer free-floating M-LOK handguard that trims weight and makes the whole package easier to handle. The 13-inch cold hammer forged barrel wears a black anodized finish and is threaded 5/8×24, so mounting a suppressor or your muzzle device of choice is straightforward. Pair that threaded muzzle with the adjustable gas regulator and you can tune the action for suppressed or unsuppressed shooting without fuss.
The kit is designed to mate with an MR762 lower and comes complete with the upper receiver, forward assist, extended convertible charging handle, bolt group assembly, and HK's proprietary buffer and action spring. It's backwards compatible with A1 MR762 receivers, though the A4's dual ambidextrous magazine and bolt catch releases only come alive on an A4 lower. Assembled in the USA from US and German-made components, it shares plenty of DNA with the HK416 family and ships in an HK soft case ready to go.
For anyone already running an MR762 or building around one, this is about as close to a drop-in performance upgrade as the platform gets. You're getting genuine HK engineering, a suppressor-ready barrel, and the peace of mind that comes with a piston gun that just keeps running.
This kit is built to mate with an MR762 lower receiver. It's also backwards compatible with older A1 MR762 lowers, but the A4's dual ambidextrous magazine and bolt catch releases only function when it's paired with an A4 receiver. Running it on an A1 lower gives you standard single-sided controls.
Yes. The 13-inch cold hammer forged barrel comes threaded 5/8×24, which is the standard pitch for .30-caliber muzzle devices and suppressor mounts. Combined with the adjustable gas block, you can tune the action for suppressed or unsuppressed use.
The MR762 uses HK's short-stroke piston and pusher rod instead of a direct-impingement gas tube. That means hot gas and carbon fouling stay forward of the receiver rather than being dumped back into the action. The payoff is a cleaner-running gun with fewer malfunctions and less maintenance over long shooting sessions.
It does. The kit comes as a complete assembly with the bolt group, HK's proprietary buffer, and action spring, along with the upper, barrel, handguard, and charging handle. Keep in mind the shortened HK buffer and spring are made for this platform and won't work in fixed-stock AR or M16-style rifles.
| UPC | 642230272545 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 51001919 |
| Action | |
| Barrel Length | 13" |
| Caliber/Gauge | .308 / 7.62 NATO |
| Color | Black |
| Model | |
| Product Type | Upper |
| Shipping Weight | 0.0 |
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