Custom Mega Arms GTR-3S / H&K MR-556 A1 5.56/.223 16” AR-15 Semi-Auto Rifle

SOLD FOR: $1540

WOA#:  WY230517RA005

Make: Mega Arms / H&K

Model: GTR-3S Lower / H&K 556 A1 Upper

Serial Number: MBL 1311

Year of Manufacture: Modern

Caliber: 5.56 (Multi)

Action Type:  Semi-Automatic, Short Stroke Gas Piston

Markings: The barrel is marked “HK MR 5.56 mmx45 MR 556”.  The left side of the upper is marked “HK BB”, “MR 556 A1 Heckler & Koch Inc. Columbus GA”.  The left side of the receiver is marked “MEGA / CAL. MUTLI / MOD. GTR-3S”, “MEGA ARMS LLC. / TUMWATER WA. USA”, “SAFE FIRE”.   The grip is marked “HOGUE GRIPS” on each side.  The buttstock is marked “FAB DEFENSE”, “MADE IN ISRAEL / PAT PEND”, “GL-SHOCK”.  The BCG is marked “HK”.

Barrel Length: 16.5”.  17.75” with Birdcage Flash Hider

Sights / Optics:  The top of the rifle has an uninterrupted picatinny rail for all your favorite sights and optics.

Stock Configuration & Condition:  The buttstock is a FAB DEFENSE stock with adjustable cheek riser and rubber buttpad.  The pistol grip is a rubber overmolded Hogue Grip with cobblestone texture.  The handguard is a 9” Picatinny Quad Rail.  The LOP measures 14” from the front of the trigger to the back of the fully extended buttpad. The stock rates in Excellent overall condition.

Magazine Quantity & Condition:  None.  Accepts standard AR-15 magazines.

Type of Finish: Anodized Black Type III Hard Coat

Finish Originality: Original

Bore Condition: The bore is bright and the rifling is sharp. There is no visible erosion in the bore.

Overall Condition:  This rifle retains about 99% of its metal finish.  The balance of the finish shows little to no operation wear.  The screw heads are sharp and the markings are clear.  There are some light scratches on the receivers.  Overall, this rifle rates in about Excellent condition.

Mechanics:  The action functions correctly.  We did not fire this rifle. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.

Box, Paperwork & Accessories: None.

Our Assessment:  The custom Mega Arms rifle with an H&K MR 556 A1 upper is a meticulously crafted firearm that combines the exceptional components of Mega Arms and Heckler & Koch to create a high-quality and unique rifle.

Mega Arms is renowned for their precision machining and attention to detail, producing top-tier AR-15 and AR-10 rifle components. Their lower receivers are known for their durability and reliability, providing a solid foundation for the custom build.

The upper receiver assembly, sourced from the H&K MR 556 A1 rifle, brings the exceptional design and features of the H&K 416 to the build. The H&K MR 556 A1 upper incorporates a gas piston operating system, which offers enhanced reliability and reduced recoil compared to traditional direct impingement systems. This system is known for its cleaner operation and reduced fouling, resulting in smoother shooting and easier maintenance. The free-floating handguard and monolithic top rail provide excellent modularity and accessory attachment options, allowing for customization to suit individual preferences.

By combining the Mega Arms lower receiver with the H&K MR 556 A1 upper, you benefit from the reliability, precision, and durability of Mega Arms components, along with the advanced gas piston operating system and design features of the H&K MR 556 A1 upper. This comprehensive combination results in a rifle that excels in terms of reliability, accuracy, and ease of maintenance.