HK MR556A1 5.56mm Rifle

The (Heckler & Koch) HK MR556A1 5.56mm rifle is a semi-automatic designed and manufactured by the German firearms company Heckler & Koch (HK). The MR556A1 is closely related to the military-grade HK416 rifle and is often considered the civilian version of the HK416.

General Specifications:

Caliber: 5.56x45mm NATO
Action: Semi-automatic, gas piston operated
Barrel Length: 16.5 inches
Twist Rate: 1:7 inches (ideal for stabilizing a wide range of bullet weights)
Operating System: Short stroke gas piston system
Weight (unloaded): About 8.6 pounds (3.9 kg)
Overall Length: Adjustable due to the collapsible stock; usually around 33.9 to 37.68 inches
Stock: Adjustable for length of pull
Handguard: Free floating, typically with M-Lok attachment points
Sights: The HK MR556A1 5.56mm Rifle may come with iron sights or may be sold without sights, depending on the configuration. Some models may have flip up backup sights.
Upper Receiver: Usually comes with a full length Picatinny rail for optics and accessories.
Lower Receiver: Compatible with standard AR-15/M16 magazines
Safety: Standard safe/semi automatic configuration
Muzzle Device: The HK MR556A1 5.56mm Rifle usually comes with with an A2 style flash hider
Finish: Matte black or similar firearm finish
Trigger: A standard semi automatic trigger, but some models may offer an enhanced trigger as an option.
Furniture: The stock, pistol grip, and handguard may vary depending on the specific model and configuration.