Rock River Arms Completed Upper Receiver A4 .223/5.56mm 10.5 Inch Barrel 1-7 Twist 1/2-28 Thread R4 Handguard A2 Flash Hide Black
Rock River Arms · Upper Receiver
No ratings yetFits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Muzzle thread
- 1/2x28 · Muzzle devices
- Barrel length
- 10.5" · Handguards
Specifications
- Manufacturer
- Rock River Arms
- Color
- Black
- Type
- Complete
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
- Thread pattern
- ½ x 28
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| MidwayUSA Best price | $577.99checked Nov 13, 2026 | In stock | Buy at MidwayUSA | |
| Kentucky Gun Co | $522.99checked Nov 13, 2026 | Out of stock | Buy at Kentucky Gun Co | |
| OpticsPlanet | $529.99Salechecked Nov 13, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $570.00 at MidwayUSA. Dashed line = out of stock. Tracking since Oct 16, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Kentucky Gun Co | $522.99 | $522.99 | $522.99 |
| MidwayUSA | $577.99 | $570.00 | $577.99 |
| OpticsPlanet | $529.99 | $529.99 | $529.99 |
Since Oct 16, 2026.
About this part
The Rock River Arms Completed Upper Receiver A4 .223/5.56mm 10.5 Inch Barrel 1-7 Twist 1/2-28 Thread R4 Handguard A2 Flash Hide Black is an AR-15 complete upper receiver from Rock River Arms. It's sold by 3 stores (1 in stock), from $522.99 to $577.99. The lowest in-stock price in the last 30 days was $570.00 at MidwayUSA.
From the manufacturer
Rock River Arms Completed Upper Receiver A4 .223/5.56mm 10.5 Inch Barrel 1-7 Twist 1/2-28 Thread R4 Handguard A2 Flash Hide Black. 223/5.56mm Completed Pistol Upper. These AR15 Upper Receivers through the skilled product professionals at Rock River Arms are designed by using heavy duty and dependable materials in order to provide you with product that will be beneficial for a long time. Manufactured utilizing some of the very best attainable materials and construction these AR15 Upper Receivers from the product specialists at Rock River Arms can last you an incredibly long time. Rock River Arms has been developing top quality products for a number of years and the Rock River Arms A4 .223/5.56mm Completed Pistol Upper is their particular means of revealing just how much they are concerned. Right here at OpticsPlanet we ensure that it is our responsibility to receive the most suitable product for all of your requirements and presenting the Rock River Arms A4 .223/5.56mm Completed Pistol Upper is a thing that we are happy to offer. Specifications for Rock River Arms A4 .223/5.56mm Completed Pistol Upper: Manufacturer: Rock River Arms Caliber: 5.56x45mm NATO .223 Wylde Firearms Threads Per Inch: 1/2x28 Handguard Type: Free-Float Finish: Anodized Color: Black Fabric/Material: A2 Thermo Mold Gas Block Journal Size-Diameter: .750 in Handguard Style: Quad Rail Gun Rail: Full Top Rail Barrel Material: Chrome Moly Bolt Carrier Group Included: COM-SPEC Charging Handle Included: COM-SPEC Magazine Included: No Included Accessories: None Mount Type: M-LOK Package Contents: Rock River Arms A4 .223/5.56mm Completed Pistol Upper Bolt Carrier Group Charging Handle Assembly Rock River Arms AR0364B: Completed Upper Receiver A4 .223/5.56mm 10.5 Inch Barrel 1-7 Twist 1/2-28 Thread R4 Handguard A2 Flash Hide Black
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