+1-800-504-5897 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

Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper Caliber: .308 Winchester, 7.62x51mm NATO, $70.01 Off w/ Free Shipping

Rock River Arms Completed Upper Receiver, Varmint A4, .308/7.62X51mm NATO, 20 Inch Barrel, 1-10 Twist, Free-Float Handguard, Black, 308A0551
Rock River Arms Completed Upper Receiver, Varmint A4, .308/7.62X51mm NATO, 20 Inch Barrel, 1-10 Twist, Free-Float Handguard, Black, 308A0551
1 of 1 images
Rock River Arms Completed Upper Receiver, Varmint A4, .308/7.62X51mm NATO, 20 Inch Barrel, 1-10 Twist, Free-Float Handguard, Black, 308A0551

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers

13% OFF AR Upper Receivers

See promotion details.
ARUPClick 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.
Caliber:
.308 Winchester, 7.62x51mm NATO
Overall Length:
28 in
Barrel Length:
20 in
Barrel Profile:
Varmint
Gas System Length:
Mid Length
Barrel Twist Rate:
1-10
Handguard Type:
Free-Float
Muzzle Device:
No
Finish:
Anadized
Color:
Black
Handguard Length:
22 in
Barrel Material:
416R Stainless Steel

Code: 1WN-URC-UP42-308A0551

MPN: 308A0551

UPC: 842834100057

List: $820.00Save $70.01
$749.99

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 Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper

Intended to be a very good product for almost anybody, we're sure you are going to enjoy the Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper.image

Developed working with some of the most robust and dependable substances available, these AR15 Upper Receivers through Rock River Arms will present you with something that gives you years of reliability.

Rock River Arms has been making high quality products for a very long time, and the Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper is their particular means of demonstrating how much they are concerned.

Right here at OpticsPlanet, we ensure that it is our responsibility to receive the perfect solution for all your preferences, and showcasing the Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper is something that we're delighted to offer.

WARNING: California`s Proposition 65

Specifications for Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper:

Manufacturer: Rock River Arms
Caliber: .308 Winchester, 7.62x51mm NATO
Overall Length: 28 in
Barrel Length: 20 in
Barrel Profile: Varmint
Gas System Length: Mid Length
Barrel Twist Rate: 1-10
Handguard Type: Free-Float
Muzzle Device: No
Finish: Anadized
Color: Black
Gas Block Journal Size-Diameter: .936 in
Handguard Length: 22 in
Gun Rail: Full Top Rail
Weight: 6.83 lb
Barrel Material: 416R Stainless Steel
Bolt Carrier Group Included: COM-SPEC
Magazine Included: No
Mount Type: M-LOK

Package Contents:

  • Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper
  • Bolt Carrier Group
  • Charging Handle Assembly

Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper Orderable Models

List of Orderable Models

  • Rock River Arms Completed Upper Receiver, Varmint A4, .308/7.62X51mm NATO, 20 Inch Barrel, 1-10 Twist, Free-Float Handguard, Black, 308A0551 , MPN: 308A0551 , UPC: 842834100057 , Code: 1WN-URC-UP42-308A0551

Rock River Arms Varmint A4 .308/7.62X51mm NATO Completed Upper Unavailable & Discontinued Models

List of Unorderable Models

  • Rock River Arms Completed Upper Receiver, Varmint A4, .308/7.62X51mm NATO, 26 Inch Barrel, 1-10 Twist, Free-Float Handguard, Black, 308A0583 , MPN: 308A0583 , UPC: 842834100064 , Code: 1WN-URC-UP42-308A0583
Compare (0)
1 item has been added
Add at least two items to compare
Last updated 2026-10-09 UTC.