H&K MR556 A4 5.56 11in Threaded Barrel M-LOK
$3,749.00
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The Heckler & Koch MR556 A4 is a compact AR-pattern firearm built around HK's short-stroke gas piston operating system. It is fitted with an 11-inch threaded barrel and a slim M-LOK handguard, and it features fully ambidextrous controls for ergonomic operation. The platform is configured to be optics-ready and to accommodate suppressed or unsuppressed use via an adjustable gas regulator.
Key Specifications
- The model is MR556 A4.
- The caliber is .223 REM / 5.56 NATO.
- The barrel measures 11 inches and is threaded with a 1/2x28 pattern.
- The operating system is a short-stroke gas piston.
- The handguard uses M-LOK attachment points.
- The receiver features a fully ambidextrous lower for control access on both sides.
- The overall length is 26.50 inches.
- The weight is 6.61 lbs.
- The rate of twist is 1-in-7".
- The controls include an ambidextrous safety lever and an HK enhanced ergonomic polymer grip.
Engineered for reliability and reduced maintenance, the MR556 A4 combines HK's piston-driven reliability with a compact, serviceable AR-pattern layout. Its threaded barrel, optics-ready receiver, and ambidextrous ergonomics make it a practical choice for range-focused shooters and professionals who value a durable, precision-capable platform.
Additional information
| upc | 642230269446 |
|---|---|
| Manufacturer | Heckler & Koch / H&K |
| Manufacturer Part Number | 81001051 |
| Action | Semi-Auto |
| ATF Type | RIFLE |
| Barrel Length | 11" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 10 + 1 |
| color | Black |
| model | MR556 A4 |
| Number of Magazines | 1 10 rd. |
| Package Height | 4.0 |
| Package Width | 13.0 |
| Product Type | AR |
| Rate of Twist | 1-in-7" |
| Safety | Ambidextrous Safety Lever |
| Shipping Weight | 10.941 |
| Sights | No Sights |
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