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Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver Up to $19.99 Off — Free 2 Day Shipping w/ code 2DAYAIR — 2 models

Special offer available for this product. Click here to see!
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
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Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
2 of 15 images
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
3 of 15 images
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
4 of 15 images
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
5 of 15 images
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
6 of 15 images
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
7 of 15 images
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
8 of 15 images
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
9 of 15 images
Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
10 of 15 images
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
11 of 15 images
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
12 of 15 images
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
13 of 15 images
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
14 of 15 images
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU
15 of 15 images
Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU

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Questions & Answers
Customer Reviews
Most Recent Reviews
budget upper built in quality by Joshua Rilea, Verified Owner, June 18, 2026
This upper is well priced for the quality of the build. I have to put rounds through it to give it a fair review. I am well pleased with the starting point and investment with the build. Gives you a good base to start
Read 1 Review

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Product Info for Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver

Introducing the RUC DI Partial Upper. Bringing the highest quality parts to the market, while offering the best value as well. This partial 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. Throw in your favorite charging handle and bolt carrier group and you are good to go!image

Specifications for Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver:

Manufacturer: Rainier Arms
Caliber: 5.56x45mm NATO
Barrel Profile: Medium
Barrel Twist Rate: 1-8
Firearms Threads Per Inch: 1/2x28
Finish: Nitride
Color: Black
Gun Model: AR-15
Fabric/Material: 416R Stainless Steel Nitrided
Gas Block Journal Size-Diameter: .750 in
Handguard Style: M-LOK w/ Top Picatinny Rail System
Gun Make: AR Platform
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No
Condition: New

Features of Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver

  • Rainier Arms Select 5.56 NATO Barrel - 16"
  • Rainier Arms Forged Upper Receiver
  • Rainier Arms Urban Combat Rail Length - 15"
  • Rainier Arms Low Profile .750 Gas Block
  • Rainier Arms FHV2 Flash Hider - Black Nitride

Package Contents:

  • Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver

What firearm models does the manufacturer say Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver is compatible with?

The manufacturer says that Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver is compatible with AR-15

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver Orderable Models

List of Orderable Models

  • Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 10.5 in, RA-RUC-DI-10C-PU , MPN: RA-RUC-DI-10C-PU , UPC: 744985352098 , Code: 4ZM-UFH-CPO24-RA-RUC-DI-10C-PU
  • Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver, 16in, Black, Medium, RA-RUC-DI-16M-PU , MPN: RA-RUC-DI-16M-PU , UPC: 744985352111 , Code: 4ZM-UFH-CPO24-RA-RUC-DI-16M-PU

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • Rainier Arms RUC DI 5.56 Nato Partial Upper Receiver, Black, 14.5 in, RA-RUC-DI-14M-PU , MPN: RA-RUC-DI-14M-PU , UPC: 744985352104 , Code: 4ZM-UFH-CPO24-RA-RUC-DI-14M-PU
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Last updated 2026-07-09 UTC.