Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! 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 Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Customer Reviews
Helpful Positive Review
Tack driver by GT, Verified Owner, November 8, 2023
I bought the 24” 1-8 twist Rock River Varmint upper. Very nice upper. Functions perfect so far. Land all brass at around 3 o’clock. THIS UPPER IS ACCURATE! So far I’ve only shot bullets 68 grains and heavier, but that is why I bought this upper...
Read More...
3/3 found this helpful
Helpful Positive Review
Circumstances have prevented me from using this upper yet. Workmanship is good, fit is near perfect and Rock River has an excellent track record. So I have every reason to expect it to shoot well. Optics Planet's service is always impeccable.
1/1 found this helpful
Most Recent Reviews
20 bull barrel rock river by T, Verified Owner, April 26, 2025
This upper is absolutely amazing. I got it paired with a rifle length buffer system. Almost no recoil and I can keep a 10-in plate floating in the air at 600 yds rapid firing. Heavy as an ar10 but takes forever to heat up
0/1 found this helpful
Most Recent Reviews
Place my order it came in a resonal amount of time . I really like there web sight.thank you...
Most Recent Reviews
upper 223 wylde by small groups, March 14, 2024
Shipping was fast. Still have to do some shooting....no problems
Read All 5 Reviews
Eligible models will have a savings offer. Apply coupon and add the item to your cart for savings on that select model! Limited time only. Cannot be combined with other promotions or offers. See promotion details.
Show In Stock Only
5 Models Available

Show with deals only:

Coupon Available
Overall Length
All
Barrel Length
All
Gas System Length
All
Barrel Twist Rate
All
Handguard Length
All
Search
Click to select this item for your bundle offer!

Buy Together and Save

As low as $574.49
You Save Up to 11%
Receive $13.60 OP Bucks
Some discounts may not apply to bundled purchases

Product Info for Rock River Arms A4 Varmint .223 Wylde Completed Upper

The Rock River Arms A4 Varmint .223 Wylde Completed Upper was created to be the ideally suited product for anybody looking for an outstanding option..image

These AR15 Upper Receivers from the skilled product professionals at Rock River Arms are made working with long lasting and reliable materials, as a way to provide you with product that will be beneficial for countless years. Manufactured using some of the very best available components and construction, these unique AR15 Upper Receivers from the product experts at Rock River Arms will last an incredibly long time.

Rock River Arms has been generating superior quality merchandise for a very long time, and the Rock River Arms A4 Varmint .223 Wylde Completed Upper is their very own manner of demonstrating exactly how much they are concerned.

Here at OpticsPlanet, we make it our responsibility to receive the most suitable solution for your specifications, and showcasing the Rock River Arms A4 Varmint .223 Wylde Completed Upper is a thing that we are happy to offer.

WARNING: California`s Proposition 65

Specifications for Rock River Arms A4 Varmint .223 Wylde Completed Upper:

Manufacturer: Rock River Arms
Caliber: .223 Wylde
Barrel Profile: Varmint
Handguard Type: Free-Float
Muzzle Device: No
Finish: Anadized
Color: Black
Gas Block Journal Size-Diameter: .920 in
Gun Rail: Full Top Rail
Barrel Material: 416R Stainless Steel
Bolt Carrier Group Included: COM-SPEC
Magazine Included: No
Mount Type: M-LOK

Package Contents:

  • Rock River Arms A4 Varmint .223 Wylde Completed Upper
  • Bolt Carrier Group
  • Charging Handle Assembly

Rock River Arms A4 Varmint .223 Wylde Completed Upper Orderable Models

List of Orderable Models

  • Rock River Arms Upper Receiver, A4 .223 Wylde, 20 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0550 , MPN: AR0550 , UPC: 842834107803 , Code: 1WN-URC-VARM-AR0550
  • Rock River Arms Upper Receiver, A4 .223 Wylde, 16 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0500 , MPN: AR0500 , UPC: 842834107766 , Code: 1WN-URC-VARM-AR0500
  • Rock River Arms Upper Receiver, A4 .223 Wylde, 18 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0525 , MPN: AR0525 , UPC: 842834107780 , Code: 1WN-URC-VARM-AR0525
  • Rock River Arms Upper Receiver, A4 .223 Wylde, 24 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0575 , MPN: AR0575 , UPC: 842834107827 , Code: 1WN-URC-VARM-AR0575
  • Rock River Arms Upper Receiver, A4 .223 Wylde, 24 Inch Barrel, Varmint Profile, 1-12 Twist, Free-Float Handguard, Black, AR0576 , MPN: AR0576 , UPC: 842834107834 , Code: 1WN-URC-VARM-AR0576
Compare (0)