HK MR556 A4 5.56 NATO Rifle

Description

Product Overview

The HK MR556 A4 is a semi-automatic rifle based on the HK416 operating system and designed for dependable performance in a practical sporting configuration. Its short-stroke gas piston system helps keep combustion residue away from the receiver, while the 16.5-inch cold hammer forged barrel is chambered for 5.56 NATO and threaded 1/2x28 for compatible muzzle devices. A fully ambidextrous lower receiver places the safety and other primary controls within easy reach from either side. The rifle includes a collapsible stock, HK416 Slim Line furniture, an M-LOK handguard, and a top rail ready for an aftermarket optic. This California-compliant configuration ships with one 10-round magazine and does not include factory sights.

Key Features

• Short-stroke gas-piston operating system helps reduce fouling in the receiver and supports consistent cycling
• 16.5-inch cold hammer forged barrel is chambered for 5.56 NATO and threaded 1/2x28 for compatible muzzle devices
• Fully ambidextrous lower receiver provides convenient controls for right- and left-handed shooters
• HK416-derived upper receiver and Slim Line furniture deliver proven handling and durability
• M-LOK handguard offers flexible accessory mounting without unnecessary bulk
• Collapsible stock adjusts overall length from 33.25 inches to 36.5 inches for adaptable storage and shooting positions

The HK MR556 A4 provides a reliable, California-compliant platform for training, recreation, and defensive rifle applications.