The HK MR556 A4 is a premium AR-15 platform, representing the fourth iteration of the civilian HK 416. It boasts significant upgrades like a factory-installed adjustable gas block for suppressed use and a fully ambidextrous lower receiver. While priced around $4,000, its exceptional build quality, refined controls, and high-performance trigger justify the 'buy once, cry once' investment for enthusiasts seeking a no-compromise rifle.
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