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Heckler And Koch (Hk USA) Mr556A4 Upper Kit 5.56mm 16.5" is a quality product from Heckler & Koch / H&K, designed for reliable performance and lasting durability. Whether you're a hunter, competitive shooter, or firearms enthusiast, Heckler & Koch / H&K products deliver the quality and reliability you expect.
Shop Heckler & Koch / H&K at Raincross Armory — your trusted source for firearms, ammunition, and accessories.
| Brand / Manufacturer | Heckler & Koch / H&K |
|---|---|
| Item # | LIP|HK51000384 |
| UPC | 642230270213 |
| Action | .223 REM/5.56 NATO |
|---|---|
| Available Colors | Black |
| Part Number | 51000384 |
| Category | AR15 Uppers |
Most in-stock items ship within 1–2 business days via UPS or USPS. Free standard shipping on orders over $99 to the contiguous United States.
All firearms must be transferred through a licensed FFL dealer. We cannot ship firearms directly to you — the firearm will be shipped to your local FFL dealer who will complete the transfer.
Questions about FFL transfers? Contact our team — we're here to help make the process smooth and compliant.
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