HK MR556 A4 5.56 NATO Rifle, 11" Barrel, Patriot Brown
HK's MR556 A4 features a short-stroke gas piston system, 11" threaded barrel, M-LOK handguard, ambidextrous controls, and adjustable gas regulator for suppressed or unsuppressed shooting.
HK MR556 A4: Modern Rifle Engineering
The HK MR556 A4 represents a thoughtful evolution in modern rifle design, built on proven short-stroke gas piston technology that has earned respect in professional and civilian shooting communities alike.
Key Features
Operating System
- Short-stroke gas piston design keeps fouling out of the action
- Runs cleaner and longer between maintenance cycles
- Reduces wear on internal components compared to direct impingement systems
- Adjustable gas regulator lets you tune performance for suppressed or unsuppressed fire
Ergonomics & Controls
- Fully ambidextrous controls for left and right-handed shooters
- Lighter weight and slimmer profile than earlier variants
- Easier to manipulate in tight spaces or from unconventional positions
- Black synthetic 6-position stock adjusts for different shooters and gear
- Black polymer grip provides secure purchase in various conditions
Barrel & Handguard
- 11" threaded barrel for sound suppressors or muzzle devices
- M-LOK handguard accepts modern tactical accessories
- Patriot Brown Picatinny rail receiver adds distinctive styling
The Practical Advantage
The MR556 A4 is built for shooters who value reliability, ease of maintenance, and adaptability. Whether you're training, competing, or simply enjoying time at the range, this rifle's piston system and thoughtful design choices make it a capable platform that rewards proper technique and care.
