The MR556 Upper is a top choice for firearm enthusiasts seeking reliability and precision. Heckler & Koch designed this upper receiver to meet high-performance standards, utilizing a gas piston system and a solid operating rod for seamless function. Its 16.5-inch cold hammer-forged barrel ensures durability and accuracy, making it a standout option for any AR-style rifle.
This upper receiver features a free-floating rail system, adding flexibility for mounting various optics and accessories. Integrating a Picatinny rail on top provides further customization options, appealing to hobbyists and professional shooters alike. Designed to be fully interchangeable with all high-quality AR-style firearms, it proves itself to be a versatile and dependable upgrade.
Features Of The MR556 Upper
The MR556 Upper boasts precise engineering and robust construction, ensuring high performance. It is also designed to be compatible with various accessories, offering flexibility and customization options for users.
Precision Engineering and Construction Details
The MR556 Upper is built with a 16.5-inch cold-hammer-forged barrel. This construction method enhances durability and accuracy. The barrel has six lands and grooves with a 1-in-7-inch twist rate, which helps stabilize a wide range of bullet weights.
The upper receiver includes a HK Free Floating Rail System (FFRS) handguard, which improves accuracy by reducing barrel movement. It also features an extended convertible charging handle and a tungsten-filled proprietary buffer, which contribute to smooth, reliable operation.
Made in the USA with some German components, the MR556 Upper combines American production standards with European precision. This design ensures high performance and longevity under various conditions.
Compatibility With Various Accessories
The MR556 Upper is highly compatible with accessories, offering users the ability to customize their firearm to meet specific needs. The Picatinny rail on the upper receiver allows easy mounting of various optics, like red dot sights or riflescopes, enhancing shooting precision.
The HK Free Floating Rail System is compatible with M-LOK accessories, enabling users to attach grips, lights, and lasers seamlessly. This adaptability makes the MR556 Upper suitable for various shooting scenarios, from tactical applications to recreational shooting.
Additionally, the upper receiver can be paired with different lower receivers, like the AR-15, broadening its usability. This versatility supports both professional and casual shooters in configuring their weapons for optimal performance.
Get your own MR556 Upper
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Benefits Of Using An MR556 Upper
The MR556 Upper receiver offers significant advantages for shooters, including improved accuracy and reliability, as well as exceptional durability in various conditions.
Enhanced Accuracy And Reliability
The MR556 Upper is designed for precision. It boasts a barrel with six lands and grooves, a right twist, and a 1 in 7″ twist rate. These features help stabilize the bullet and provide consistent shot placement.
The gas piston operating system in the MR556 reduces fouling and heat build-up in the bolt carrier group. This results in fewer malfunctions. This system also makes cleaning easier, which further enhances reliability.
Using high-quality materials, Heckler & Koch ensures that the MR556 Upper maintains performance over long shooting sessions. This makes it a trusted choice for both professionals and hobbyists alike.
Durability In Various Conditions
The MR556 Upper is built to last. Its components are made from robust materials which can endure harsh environments. Whether exposed to mud, dust, or moisture, the MR556 Upper continues to function effectively.
The finish on the MR556 is corrosion-resistant. This ensures that even after exposure to elements, the upper remains in good condition.
The strong build quality combined with a reliable gas system ensures the upper performs efficiently in both extreme heat and cold. This makes it suitable for various climates and operational situations, offering shooters reassurance in any environment.
Installation And Maintenance Tips
Installing and maintaining the MR556 upper involves carefully following steps to ensure proper function and longevity. Both the installation process and regular upkeep are crucial for optimal performance.
Proper Installation Procedures
To install the MR556 upper, start by ensuring the lower receiver is clean and free of any debris. Align the upper receiver with the lower receiver pivot pin and push the pin through. Ensure it is securely fastened.
Attach the charging handle by inserting it into the upper receiver and sliding it forward until it seats correctly. Insert the bolt carrier group, making sure the bolt is forward.
Check that the upper and lower receivers are properly aligned, and use the takedown pin to lock them together. Inspect for any loose parts and ensure the Picatinny rail is free of obstructions before mounting any optics. Installing the MR556 upper correctly will ensure reliable operation and accuracy.
Regular Maintenance For Longevity
Proper maintenance is key to keeping the MR556 upper in top condition. Clean the barrel regularly using a bore brush and solvent to remove fouling and debris. It’s important to keep the gas piston and rod assembly clean, as these components are critical for the gas system.
Lubricate the bolt carrier group lightly with high-quality gun oil. Apply oil to the bolt itself, the bolt carrier, and the rails inside the upper receiver. Periodic inspections of the charging handle, forward assist, and ejection port cover for wear and tear can help avoid functional issues.
Replace worn parts promptly and store the rifle in a cool, dry place to prevent rust and corrosion. Regular maintenance extends the life of the MR556 upper, ensuring it performs well under various conditions.
Frequently Asked Questions
The HK MR556 upper receiver is known for its durability and high-quality performance. Here are some specific details about its features and compatibility.
What are the characteristics and performance differences between HK416 upper and MR556 upper?
The HK416 upper is designed for military use, featuring a shorter gas system and chrome-lined barrel. The MR556 upper, built for civilian usage, has a non-chrome-lined barrel and a different gas system for reduced recoil and increased durability.
Can the HK MR556 upper be reliably used on a standard AR-15 lower receiver?
Yes, the HK MR556 upper can be used on a standard AR-15 lower receiver. It is compatible with most mil-spec lowers, making it a popular choice for AR-15 owners seeking enhanced performance.
What are the Specifications and features of the HK MR556 11.5-inch upper?
The HK MR556 11.5-inch upper includes a 5.56 x 45 mm caliber, 1 in 7″ twist rate, and right-hand twist with six lands and grooves. Its robust design makes it suitable for various tactical and shooting applications.
Is the MR556 upper’s barrel chrome-lined?
The MR556 upper’s barrel is not chrome-lined. This non-chrome-lined barrel can provide better accuracy for precision shooting but may require more maintenance than a chrome-lined barrel.
What’s the weight of the HK MR556 upper compared to similar models?
The HK MR556 upper weighs around 4.5 pounds. This weight is comparable to high-end AR-15 uppers, ensuring a well-balanced firearm without compromising performance.
Thread pitch on the barrel of the MR556 and suppressor compatibility
The barrel of the MR556 has a thread pitch of 1/2×28. This standard pitch is compatible with many popular suppressors, making it versatile for various shooting needs.
