Rock River Arms MR556 A4 5.56 NATO 16.5"
Rock River Arms MR556 A4 features a 16.5" barrel in 5.56 NATO with 30-round capacity. Gray furniture and A4-profile upper receiver deliver reliable modern sporting rifle performance.
Rock River Arms MR556 A4: The Practical Modern Rifle
The Rock River Arms MR556 A4 represents a thoughtful approach to the modern sporting rifle. This is a firearm built on proven principles, executed with attention to detail.
Key Features
- Caliber & Capacity: 5.56 NATO with 30-round magazine
- Barrel: 16.5" chrome-moly steel, optimized for velocity and handling
- Upper Receiver: A4-profile configuration, a time-tested design
- Furniture: Gray components for a clean, professional appearance
- Reliability: Rock River Arms' reputation for quality manufacturing
Design Philosophy
The A4 profile upper receiver has proven itself across decades of use. The 16.5" barrel strikes a balance between velocity and maneuverability—long enough to develop the cartridge's potential, short enough for practical handling in varied environments.
The 5.56 NATO chambering offers versatility. Whether for sport shooting, training, or home defense, this round delivers proven performance with readily available ammunition.
Practical Considerations
This rifle accepts standard AR-platform accessories and magazines, making customization straightforward. The gray finish provides a neutral aesthetic while resisting corrosion.
Rock River Arms builds rifles for shooters who value function over flash. The MR556 A4 is a solid, dependable choice for anyone seeking a modern rifle that simply works.
Features
- short stroke gas piston
- hk416 upper receiver
- m-lok handguard
