H&K MR556 A4 5.56x45mm 11in Threaded Barrel 10+1

The Heckler & Koch MR556 A4 is a compact, piston-driven semi-automatic carbine chambered in .223 Rem / 5.56 NATO with an 11 inch threaded barrel. Its short-stroke gas piston operating system reduces carbon fouling in the action, lowering maintenance and internal wear. An adjustable gas regulator supports suppressed or unsuppressed operation, and fully ambidextrous controls combined with a slimmer profile improve handling and manipulation.

Key Specifications

• The caliber is .223 Rem / 5.56 NATO.
• The barrel measures 11 inches and is threaded.
• The action is Semi-Auto.
• The capacity is 10 + 1.
• The unloaded weight is approximately 6.61 lbs.
• The overall length is 26.50 inches.
• The stock is black synthetic, 6-position.
• The forend uses an M-LOK handguard with a Patriot Brown Picatinny receiver rail.
• The grip is black polymer.
• The safety features a ambidextrous safety lever.

Built around a dependable short-stroke piston system and an adjustable gas regulator, the MR556 A4 delivers reduced maintenance demands and adaptable performance for range use, duty applications, or compact utility roles. Its ambidextrous controls and ergonomic layout make it straightforward to operate from either shoulder while the threaded barrel and modular rail system support accessories and suppressor-ready setups.

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