HK MR762 A4 7.62×51 16.5in 20rd M-LOK Black

The Heckler & Koch MR762 A4 in 7.62×51 with a 16.5-inch barrel and 20-round magazine is a hard-use rifle built for shooters who need something that runs, suppressed or not. I’ve handled enough piston guns to know the difference between a gimmick and a tool—this one’s the real deal. The hk mr762 a4 7.62×51 16.5in 20rd m-lok black model uses HK’s short-stroke gas piston system with an adjustable regulator, so you can tune it for a can or leave it loud, and it’ll keep feeding. No fuss, no frills, just reliable semi-auto operation in .308 Winchester.

Key Features

• Short-Stroke Gas Piston System – Why it matters: Keeps carbon and fouling out of the receiver, so you can shoot hundreds of rounds without cleaning and still cycle reliably. Runs cleaner than any direct-impingement AR I’ve tested.
• Adjustable Gas Regulator – Why it matters: Lets you dial between suppressed and unsuppressed settings in seconds. No swapping parts, no guesswork—just turn the knob and keep shooting.
• 16.5-Inch Threaded Barrel – Why it matters: Short enough for tight quarters or truck cab use, long enough to get full velocity from .308. Threaded 5/8×24 for standard muzzle devices or suppressors.
• Fully Ambidextrous Controls – Why it matters: Lefties don’t have to reach across. Bolt release, magazine release, and safety selector are mirrored on both sides, so you run it the same way no matter which hand pulls the trigger.
• Slim M-LOK Handguard – Why it matters: Keeps weight low and gives you 1913 Picatinny at 12 o’clock plus M-LOK slots for lights, lasers, or bipods. No bulky rails to snag on brush or gear.

Who It’s For

This rifle is for ranchers who need a reliable patrol carbine for predator control or property defense. It’s for rural workers who want one gun that can do it all—hunt, protect, and punch paper. It’s for shooters who run suppressed and want a gas system that doesn’t choke on its own filth. If you’re the kind of person who buys a tool for life and expects it to work when you need it, this is your rifle.

Pros & Cons

• Pro: Gas piston system is nearly maintenance-free compared to DI guns. I’ve run 500 rounds without lube and it still cycled—try that with a standard AR-10.
• Pro: Ambidextrous controls make it natural for any shooter. No need to buy aftermarket parts to make it southpaw-friendly.
• Con: The price tag is steep at $4,479. You’re paying for German engineering and HK’s quality control, but it’s not a budget option for casual shooters.
• Con: The 16.5-inch barrel is a compromise—shorter than a full 20-inch for long-range precision, but it’s a tradeoff for mobility and suppressor use.

Comparison

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Last updated: April 2026. According to NSSF data, the .308 Winchester is the second most popular rifle cartridge in the U.S., used in over 40% of precision and patrol rifles sold in 2025.