Rock River Arms Completed Upper Receiver X-1 .223 Wylde 18 Inch Barrel 1-8 Twist 1/2-28 Threat Free-Float Handguard Brake Tan
$835.99 at MidwayUSA · 2 stores
In stock
Rainier Arms RUC DI 5.56 NATO Complete Upper 16in Black Medium
No ratings yetBest price
$830.00at OpticsPlanet
Out of stock checked Oct 22, 2026
In stock now instead
- Rock River Arms Completed Upper Receiver X-1 .223 Wylde 18 Inch… $835.99at MidwayUSA
- Patriot Ordnance Factory Minuteman 16.5" Complete Upper 5.56x45… $819.89at Kentucky Gun Co
- Rock River Arms Completed Upper Receiver National Match A2 .223… $809.99at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $830.00checked Oct 22, 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.
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This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
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Price history
Dashed line = out of stock. Tracking since Oct 15, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $830.00 | $830.00 | $830.00 |
Since Oct 15, 2026.
About this part
The Rainier Arms RUC DI 5.56 NATO Complete Upper 16in Black Medium is an AR-15 complete upper receiver from Rainier Arms. One store lists it, OpticsPlanet at $830.00.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 16" · Handguards
Specifications
- Manufacturer
- Rainier Arms
- Color
- Black
- Type
- Complete
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
Rainier Arms RUC DI 5.56 NATO Complete Upper 16in Black Medium. Bringing the highest quality parts to the market while offering the best value as well. This complete upper utilizes a direct impingement operating system on their new and improved Rainier Arms Select barrel. Pairing up with their Urban Combat Rail to provide shooters with a rock solid handguard that can take any abuse. The complete upper is finished off with their Rainier Industries Avalanche ANC charging handle and their Rainier Arms FHV2 Flash Hider. Specifications for Rainier Arms RUC DI 5.56 NATO Complete Upper: Manufacturer: Rainier Arms Caliber: 5.56x45mm NATO Barrel Length: 16 in Gas System Length: Mid Length Firearms Threads Per Inch: 1/2x28 Color: Black Gun Model: AR-15 Fabric/Material: 416R Stainless Steel Nitrided Gas Block Journal Size-Diameter: .750 in Gun Type: Rifle Gun Make: AR Platform Magazine Included: No Package Contents: Rainier Arms RUC DI 5.56 NATO Complete Upper What firearm models does the manufacturer say Rainier Arms RUC DI 5.56 NATO Complete Upper is compatible with? The manufacturer suggests that Rainier Arms RUC DI 5.56 NATO Complete Upper is compatible with AR-15Rainier Arms RA-RUC-DI-16M-CU: RUC DI 5.56 NATO Complete Upper 16in Black Medium
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