H&K MR556 A4 81001202 | 5.56 11in Threaded | 10+1

The Heckler & Koch MR556 A4 features a short-stroke gas piston operating system designed to reduce hot carbon fouling in the action, increasing service intervals and reducing wear. Its adjustable gas regulator allows tuning for suppressed or unsuppressed operation, and fully ambidextrous controls simplify manipulation for left- or right-handed users. The rifle-length ergonomics, M-LOK handguard and 11″ threaded barrel put this configuration in a compact, versatile package; consider pairing it with a Vortex Strike Eagle 1-6×24 for a durable optic choice under $1000 suitable for close-to-midrange work.

Product Specifications

• The action is Semi-Auto.
• The caliber is listed as .223 REM/5.56 NATO.
• The barrel measures 11 inches and is threaded.
• The barrel length range is 11 to 11.99 inches.
• The capacity is 10 + 1.
• The weight is 6.61 lbs.
• The weight range is 6 lbs to 6.99 lbs.
• The overall length is 26.50 inches.
• The grip material is Black Polymer.
• The stock material is Synthetic with a Black finish and 6 position adjustment.
• The rifle features an M-LOK handguard and a Patriot Brown Picatinny rail receiver.
• The safety is a Ambidextrous Safety Lever.
• The operating system is a short-stroke gas piston with an adjustable gas regulator for suppressed or unsuppressed use.
• The finish and external components include a Black threaded barrel, Black synthetic 6-position stock, and Black polymer grip.
• The UPC is 642230271067.

Well-suited for organized range training and competitive carbine events, the MR556 A4 combines reduced maintenance demands with modern accessory compatibility. Its adjustable gas system and ambidextrous controls make it a practical choice for shooters who need a compact 5.56 platform that accepts industry-standard optics and accessories.

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