In Stock
Type
parts
Last Seen
May 20, 2026
Heckler & Koch Upper Receiver Kit MR556A4 16.5 Inch AR Style
Sold byShooting Surplus•Posted May 20, 2026
Compare prices for HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 16.5" Barrel$2,179.00
Price and stock data refresh continuously from Shooting Surplus.
Deal Summary
- Currently in stock.
- Category: parts
- UPC: 642230270213
- SKU: 178700
- Brand: Hk
Price History
Deal Details
The Heckler & Koch HK 51000384 Upper Receiver Kit MR556A4 16.5" delivers a precision-built solution for AR-style platforms, combining HKs renowned engineering with a reliable upper receiver assembly tailored for the MR556A4 configuration and a 16.5-inch length that balances maneuverability with effective barrel performance. This kit integrates critical components designed to enhance fit, function, and reliability in field-ready rifle builds, supporting smooth cycling, consistent alignment, and s
Other Offers for This Product
Active offers from your catalog for HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 16.5" Barrel.
Comparing 7 retailers carrying this product
Lowest Price: $1,993.00
Highest Price: $2,179.00
You Save: $186.00
Avg Discount: 5% off
HK 51000384 MR556 Upper Rcvr Kit 5.56mm for AR15/M16/M4,Upper
Heckler & KochHinterland OutfittersSKU/UPC: 235036
$1,993.00
View at Hinterland Outfitters
HK USA MR556A4 Upper Receiver Kit 5.56 NATO 16.5"
Hk UsaKYGUNCOSKU/UPC: HCK-51000384
$2,059.65
View at KYGUNCOHeckler & Koch Upper Receiver Kit MR556A4 16.5 Inch AR Style
Heckler & KochRetailerSKU/UPC: 178700
$2,179.00
View deal
HK 51000384 UPPER RECEIVER KIT MR556A4 16.5
Heckler & Koch, Inc.BattleHawk ArmorySKU/UPC: 642230270213
$2,179.00$2,499.00Save 13%
View at BattleHawk Armory
HK UPPER RECEIVER KIT MR556A4 16.5''
Heckler & KochOptics PlanetSKU/UPC: 13-UPK-51000384
$2,179.00$2,499.00Save 13%
View at Optics Planet
HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 16.5" Barrel
HkMidwayUSASKU/UPC: 220277
$2,179.00
View at MidwayUSA
Heckler and Koch MR556 A4 Upper Receiver 5.56 16.5 Barrel
Heckler And KochGrabAGunSKU/UPC: GAG_51000384-178700
$2,179.00$2,499.00Save 13%
View at GrabAGun