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HK MR556 Upper Receiver Kit, 16.50" Black 5.56mm for AR15/M16/M4 - 51000384 by Hk -

Price history at DEGuns

Price at DEGuns unchanged at $2,179.00 since Oct 9, 2026. Last checked Oct 30, 2026.

Product Description

Product Features & Specifications HK 51000384 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4 This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted to HKs piston and pusher rod system. This system utilizes a piston and a pusher ro

HK MR556 Upper Receiver Kit, 16.50" Black 5.56mm for AR15/M16/M4 - 51000384

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$2179.00
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Product Details

Brand Hk
MPN 51000384
Hk

Price history at DEGuns

Price at DEGuns unchanged at $2,179.00 since Oct 9, 2026. Last checked Oct 30, 2026.

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