+1-800-504-5897 Live Chat Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver Up to $19.99 Off w/ Free S&H — 2 models

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
1 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
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

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
You May Also Like
Best Rated Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI571BLK-30RD
Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI571BLK-30RD
(61)
List: $24.99 $12.30 Save Up to 51%
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI556BLK-30RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI556BLK-30RD
(56)
List: $32.43 $23.99 Save Up to 26%
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI557BLK-30RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI557BLK-30RD
(40)
List: $30.36 $15.49 Save Up to 49%
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Medium Coyote Tan, 1 Pack, Polymer, MAG556-MCT-30RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Medium Coyote Tan, 1 Pack, Polymer, MAG556-MCT-30RD
(56)
List: $32.55 $23.99 Save Up to 26%
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 20 Round, Black, 1 Pack, Polymer, MAG560BLK-20RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 20 Round, Black, 1 Pack, Polymer, MAG560BLK-20RD
(26)
List: $30.79 $21.99 Save Up to 29%
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Medium Coyote Tan, 1 Pack, Polymer, MAG557-MCT-30RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Medium Coyote Tan, 1 Pack, Polymer, MAG557-MCT-30RD
(40)
List: $29.95 $14.99 Save Up to 50%
Best Rated Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI570BLK-30RD
Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI570BLK-30RD
(14)
List: $31.04 $21.99 Save Up to 29%
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Remington, 40 Round, Black, 1 Pack, Polymer, MGMPI233BLK-40RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Remington, 40 Round, Black, 1 Pack, Polymer, MGMPI233BLK-40RD
(12)
List: $42.33 $27.99 Save Up to 34%
Blazin' Deal Strike Industries AR-15 .223 Remington/5.56 NATO Rifle Magazine, 33 Round, Smoke Gray, 1 Pack, Polymer, Smoke, 0, SI-AR-MAG-33RD
Strike Industries AR-15 .223 Remington/5.56 NATO Rifle Magazine, 33 Round, Smoke Gray, 1 Pack, Polymer, Smoke, 0, SI-AR-MAG-33RD
(11)
List: $17.95 $13.73 Save Up to 24%
Walker Defense Research 3 M-LOK Slot Length Nile Silicon Carbide M-LOK Rail Covers, 3 Pack, NILE-3-SLOT-3-PACK
Walker Defense Research 3 M-LOK Slot Length Nile Silicon Carbide M-LOK Rail Covers, 3 Pack, NILE-3-SLOT-3-PACK
(3)
$59.99
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

13% OFF Firearm Parts

See promotion details.
HOTDLClick to Copy Coupon Code
Eligible models will have a savings offer and the coupon code to use below. Add the item to your cart and enter coupon code for savings on that select model! Limited time only. Cannot be combined with other promotions or offers.
Show In Stock Only
2 Models Available

Show with deals only:

Coupon Available
Weight
All
Barrel Length
All
Handguard Length
All
Gas System Length
All
Search

ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

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
Compare (0)
1 item has been added
Add at least two items to compare
Last updated 2026-08-21 UTC.