In StockSave 13%
Heckler and Koch MR556 A4 Upper Receiver/Barrel Assembly 5.56 11 Barrel
Sold byGrabAGun•Posted Apr 27, 2026
Compare prices for HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 11" Barrel$2,179.00
$2,499.00
You save $320.00 (13% off)
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Deal Summary
- Currently in stock.
- Caliber: 223/5.56
- Category: parts
- UPC: 642230270220
- SKU: GAG_51000385-178701
- Brand: Hk
Price History
Deal Details
Heckler & Koch MR556 A4 11 Upper Receiver Features Optimized for suppressed and CQB applications the 11-inch MR556 A4 upper is built around HK's short-stroke gas piston system with an adjustable gas block enabling smooth function with or without a suppressor. The 1/2x28 threaded barrel is concentric and precision-machined ensuring compatibility with muzzle devices and suppressors. It includes a monolithic M-LOK handguard with integrated ambidextrous QD sling cups a continuous Picatinny rai
Other Offers for This Product
Active offers from your catalog for HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 11" Barrel.
Comparing 6 retailers carrying this product
Lowest Price: $1,993.00
Highest Price: $2,179.00
You Save: $186.00
Avg Discount: 6% off
HK 51000385 MR556 Upper Rcvr Kit 5.56mm for AR15/M16/M4,Upper
Heckler & KochHinterland OutfittersSKU/UPC: 235037
$1,993.00
View at Hinterland Outfitters
Heckler and Koch MR556 A4 Upper Receiver/Barrel Assembly 5.56 11 Barrel
Heckler And KochGrabAGunSKU/UPC: GAG_51000385-178701
$2,179.00$2,499.00Save 13%
View at GrabAGun
HK MR556 A4 AR-15 Complete Upper Receiver 5.56x45mm NATO 11" Barrel
HkMidwayUSASKU/UPC: 714547
$2,179.00
View at MidwayUSA
HK MR556 A4 11 Complete Upper Receiver Kit 5.56 NATO CHF Barrel Piston System Free Float Rail Black
Heckler & Koch, Inc.BattleHawk ArmorySKU/UPC: 642230270220
$2,179.00$2,499.00Save 13%
View at BattleHawk Armory
HK UPPER RECEIVER KIT MR556A4 11''
Heckler & KochOptics PlanetSKU/UPC: 13-UFH-51000385
$2,179.00$2,499.00Save 13%
View at Optics Planet