Heckler & Koch MR556 A4 Patriot Brown Receiver M-LOK 5.56 NATO Black Rifle
Caliber: 5.56 NATO · Capacity: 10+1
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Specifications
Action Semi-Automatic
Ambidextrous Safety Yes
Barrel Length 16.5 inches
Caliber / Gauge 5.56 NATO
Capacity 10+1
Finish Black
Grip Safety No
Magazines Included 1
Manual Safety Yes
Optic Ready Yes
Overall Length 32.5 inches
Sights Standard Sights
Threaded Barrel Yes
Trigger Safety No
Weight 8.6 pounds
Description
Product Overview
The Heckler & Koch MR556 A4 is a semi-automatic 5.56 NATO rifle built around HK’s short-stroke gas-piston operating system. This configuration combines a 16.5-inch threaded barrel with a Patriot Brown receiver, Picatinny top rail, M-LOK handguard, and six-position adjustable stock. The full-length rail supports the installation of a wide range of optics, while the factory flip-up sights provide a practical aiming solution when an optic is not installed. Its ambidextrous controls and adjustable stock support adaptable handling for a variety of shooting positions and users.
Key Features
- Short-stroke gas-piston system supports reliable semi-automatic operation
- 16.5-inch threaded barrel accommodates compatible muzzle devices
- Full-length Picatinny rail is optic ready for versatile sighting setups
- M-LOK handguard provides flexible accessory mounting with reduced bulk
- Six-position adjustable stock helps tailor length of pull
- Ambidextrous manual safety supports adaptable controls
The MR556 A4 combines HK operating-system features with a versatile rail and M-LOK configuration for range, training, and duty-oriented use.
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV
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- SKU:
- 81001204
- UPC:
- 642230271081
- BUDS ID:
- 180690
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Retail Availability
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1105 Industry Road, Lexington, KY 40505
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| Action | Semi-Automatic | Semi-Automatic | Semi-Automatic | Semi-Automatic | Semi-Automatic |
| Ambidextrous Safety | Yes | Yes | Yes | Yes | Yes |
| Barrel Length (in.) | 16.5 | 16.1 | 16.0 | 16.1 | 16.1 |
| Caliber / Gauge | 5.56 NATO | 5.56 NATO | 5.56 NATO | 5.56 NATO | .223 Remington, 5.56 NATO |
| Capacity | 10 | 30 | 10 | 30 | 30 |
| Finish | Black | Tungsten Grey | Black | Black | Brown |
| Manual Safety | Yes | Yes | Yes | Yes | Yes |
| Optic Ready | Yes | Yes | Yes | Yes | Yes |
| Overall Length (in.) | 32.5 | 32.25 | 28.25 | 32.5 | 32.5 |
| Sights | Standard Sights | Standard Sights | Standard Sights | Standard Sights | Standard Sights |
| Threaded Barrel | Yes | Yes | Yes | Yes | Yes |
| Weight (lbs) | 8.6 | 7.3 | 8.0 | 7.3 | 7.3 |
| Actions | Current Item |
