H&K MR556 A4 5.56mm NATO 16.5in 30rd Semi-Auto Rifle (81000827)
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Heckler & Koch
Overview
The Heckler & Koch MR556 A4 is the semi-automatic civilian version of the HK416, chambered in 5.56 NATO with a 16.5 inch barrel and a 30 round magazine. It runs HK's short stroke gas piston system instead of direct impingement, which keeps carbon out of the receiver.
Specifications
Available Merchants(6)
Prices checked
Price Alert
Build history on GunPartPicker
Builders on GunPartPicker first added the Heckler & Koch H&K MR556 A4 5.56mm NATO 16.5in 30rd Semi-Auto Rifle (81000827) to a build in October 2026.
It was in stock most days in September 2026, and today 4 of the 6 retailers we track have it in stock. Prices barely moved in September 2026, holding around $3,749, so there haven't been real sales lately. Buying today, the lowest price is $3,749 at MidwayUSA, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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