Heckler & Koch MR556 A4 Piston-Operated 5.56 NATO Patriot Brown Rifle
Caliber: 5.56 NATO · Capacity: 30+1
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Specifications
Action Semi-Automatic
Ambidextrous Safety Yes
Barrel Length 16.5 inches
Caliber / Gauge 5.56 NATO
Capacity 30+1
Finish Patriot Brown
Grip Safety No
Magazines Included 1
Manual Safety Yes
Optic Ready Yes
Overall Length 36.5 inches
Threaded Barrel Yes
Trigger Safety No
Weight 7.67 pounds
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
Description
Product Overview
The Heckler & Koch MR556 A4 is a semi-automatic 5.56 NATO rifle built around a reliable short-stroke gas-piston operating system. Its 16.5-inch cold hammer-forged steel barrel uses a 1:7 twist rate to stabilize a broad range of bullet weights and features a threaded muzzle for compatible muzzle devices. A free-floating M-LOK handguard supports accessory mounting while helping preserve accuracy. The rifle also includes a six-position adjustable synthetic stock, ambidextrous safety lever, optic-ready receiver rail, and a factory trigger pull set between 4.5 and 5.6 pounds. Finished in Patriot Brown, it combines adaptable controls with a durable, precision-oriented configuration.
Key Features
- Short-stroke gas-piston system provides dependable semi-automatic operation
- 16.5-inch cold hammer-forged barrel is designed for long service life and consistent accuracy
- 1:7 twist rate stabilizes a wide range of 5.56 NATO bullet weights
- Threaded muzzle accepts compatible muzzle devices and suppressors
- Free-floating M-LOK handguard provides flexible accessory mounting
- Ambidextrous safety lever accommodates right- and left-handed operation
The MR556 A4 offers a versatile piston-operated rifle platform for precision, training, sporting, and tactical applications.
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- SKU:
- 81001203
- UPC:
- 642230271074
- BUDS ID:
- 180689
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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 | 16.0 | 16.1 | 16.0 | 16.1 |
| Caliber / Gauge | 5.56 NATO | 5.56 NATO | 5.56 NATO, .223 Remington | 5.56 NATO | 5.56 NATO |
| Capacity | 30 | 30 | 30 | 30 | 30 |
| Manual Safety | Yes | Yes | Yes | Yes | Yes |
| Optic Ready | Yes | Yes | Yes | Yes | Yes |
| Overall Length (in.) | 36.5 | 36.5 | 32.5 | 33.5 | 32.25 |
| Threaded Barrel | Yes | Yes | Yes | Yes | Yes |
| Weight (lbs) | 7.67 | 7.7 | 7.3 | 7.8 | 7.3 |
| Finish | Patriot Brown | Black Anodized | Brown | N/A | Tungsten Grey |
| Sights | N/A | Standard Sights | Standard Sights | Standard Sights | Standard Sights |
| Actions | Current Item |
