+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

Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver M489UPPER-16-556 Caliber: 5.56x45mm NATO, Overall Length: 16 in, $45.00 Off w/ Free Shipping

Special offer available for this product. Click here to see!
Limited Time Offer. Click here to see!
00:14
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
1 of 1 videos
Sons of Liberty Gun Works Nox
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
1 of 5 images
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
2 of 5 images
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
3 of 5 images
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
4 of 5 images
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556
5 of 5 images
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
You May Also Like
Best Rated Strike Industries Rifle Magazine, AR-15, .223 Remington/5.56 NATO, 33 Round, Smoke Gray, 1 Pack, Polymer, SI-AR-MAG-33RD
Strike Industries Rifle Magazine, AR-15, .223 Remington/5.56 NATO, 33 Round, Smoke Gray, 1 Pack, Polymer, SI-AR-MAG-33RD
(10)
List: $13.95 $12.95 Save $1.00
Warpath Coffee Mariner's Blend Ground Coffee, Dark Roast, Black, 12 Ounce, 104, 104
Warpath Coffee Mariner's Blend Ground Coffee, Dark Roast, Black, 12 Ounce, 104, 104
(2)
List: $19.99 $14.95 Save $5.04
Coupon Available PMC Ammunition 556K X-Tac, 5.56x45mm NATO, 62 grain, Light Armor Piercing, Brass, Centerfire Rifle Ammo, 20, 5.56
PMC Ammunition 556K X-Tac, 5.56x45mm NATO, 62 grain, Light Armor Piercing, Brass, Centerfire Rifle Ammo, 20, 5.56
(99)
List: $14.99 $10.79 Save Up to $180.00
Clearance TRYBE Defense Complete Upper Receiver, AR-15, 5.56x45mm NATO, 16in 5R Barrel, 1-7 Twist, 15in M-LOK Rail, A2 Flash Hider, BCG and CH, Nitride Black, UPPER16556
TRYBE Defense Complete Upper Receiver, AR-15, 5.56x45mm NATO, 16in 5R Barrel, 1-7 Twist, 15in M-LOK Rail, A2 Flash Hider, BCG and CH, Nitride Black, UPPER16556
(49)
List: $549.99 $369.99 Save Up to $180.00
Blazin' Deal TRYBE Defense AR-15 M-LOK 15in Extra Lightweight Handguard w/ Cut Away Rail, Black, 15 Inch, HDG15CR-BL
TRYBE Defense AR-15 M-LOK 15in Extra Lightweight Handguard w/ Cut Away Rail, Black, 15 Inch, HDG15CR-BL
(88)
List: $159.99 $109.99 Save Up to $58.29
Blazin' Deal TRYBE Optics DiMA1000 Laser Rangefinder with Mount, Black, TROLRF
TRYBE Optics DiMA1000 Laser Rangefinder with Mount, Black, TROLRF
(6)
List: $764.99 $647.73 Save Up to $205.00
Blazin' Deal TRYBE Optics Enhancer Rifle Scope Magnification Quadrupler, 4x54mm, 30mm Tube, Black, ENHRS4X
TRYBE Optics Enhancer Rifle Scope Magnification Quadrupler, 4x54mm, 30mm Tube, Black, ENHRS4X
(4)
List: $799.99 $304.00 Save Up to $526.00
Final Sale TRYBE Defense 5.56 NATO Medium Profile AR Rifle Barrel, Black, 16in, BARRIF16556
TRYBE Defense 5.56 NATO Medium Profile AR Rifle Barrel, Black, 16in, BARRIF16556
(8)
List: $174.99 $99.99 Save Up to $100.18
Clearance TRYBE Defense AR-15 Pistol Complete Upper Receiver, 5.56mm, 10.5in, 1-7 Twist, A2 Flash hider, UPPER105556
TRYBE Defense AR-15 Pistol Complete Upper Receiver, 5.56mm, 10.5in, 1-7 Twist, A2 Flash hider, UPPER105556
(49)
List: $429.99 $279.99 Save Up to $180.00
Blazin' Deal TRYBE Defense Cowl Induction Muzzle Brake, 5.56/.223 Remington, 5/8x24, Black, TRBCIB55658x24
TRYBE Defense Cowl Induction Muzzle Brake, 5.56/.223 Remington, 5/8x24, Black, TRBCIB55658x24
(42)
List: $132.99 $99.99 Save Up to $145.50
Questions & Answers
is the muzzle pin and welded

What I’ve gathered from another website: “If you’re looking for your next high-quality AR-15 rifle build, then a Sons of Liberty M4-89 barreled upper receiver is a great place to start.” … “Pinned & Welded
5.56 NATO
13.7” HPT/MPI 4150 CMV Barrel
Mid-Length Gas System
13.75″ M89 Free Float M-LOK Drive Lock Handguard
Nox Muzzle Device
No Charging Handle
No Bolt Carrier Group”

by Chung, Verified Owner, March 6, 2025
See 2 More Answers
Is this a cold hammer forged barrel?

The Combat Barrel part is the name they have for Cold Hammer forged barrels not sure if this is the V1 or V2 though

by Garrett Reed, Verified Owner, January 12, 2025
View All Q&A You Have a Question? Ask!
Caliber: 5.56x45mm NATO Overall Length: 16 inBarrel Length: 15 inColor: Black Handguard Length: 15 in

Code: 40W-UFH-556M4H-M489UPPER-16-556

MPN: M489UPPER-16-556

UPC: 785939519181

Final Sale
List: $900.00Save $45.00
$855.00

Buy Together and Save

Receive $17.10 OP Bucks

Product Info for Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver

If you're searching for a fantastic price on the Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver, then you have turned up at the right location..image

Formulated using some of the most strong and long lasting components in existence, these AR15 Upper Receivers by Sons of Liberty Gun Works can provide an item which will give many years of dependability.

Sons of Liberty Gun Works has been making superior quality merchandise for a number of years, and the Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver is their particular means of revealing how much they care.

At OpticsPlanet, we make it our obligation to obtain the most suitable solution for your specifications, and presenting the Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver is a thing that we are pleased to offer.

Specifications for Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver:

Manufacturer: Sons of Liberty Gun Works
Caliber: 5.56x45mm NATO
Overall Length: 16 in
Barrel Length: 15 in
Color: Black
Handguard Length: 15 in
Gun Make: AR Platform
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No

Package Contents:

  • Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver

Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver Orderable Models

List of Orderable Models

Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 16in, 15in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-16-556 , MPN: M489UPPER-16-556 , UPC: 785939519181 , Code: 40W-UFH-556M4H-M489UPPER-16-556

Sons of Liberty Gun Works M4-89 5.56 Half Complete Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 10.5in, 9.5in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-10.5-556 , MPN: M489UPPER-10.5-556 , UPC: 785939519143 , Code: 40W-UFH-556M4H-M489UPPER-10-5-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 11.5in, 10.5in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-11.5-556 , MPN: M489UPPER-11.5-556 , UPC: 785939519150 , Code: 40W-UFH-556M4H-M489UPPER-11-5-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 12.5in, 11.5in, Combat Barrel, M89 Rail, A2 Flash Hider, No BCG or CH, Black, M489UPPER-12.5-556 , MPN: M489UPPER-12.5-556 , UPC: 676821222589 , Code: 40W-UFH-556M4H-M489UPPER-12-5-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 13.7in, 13.75in, Combat Barrel, M89 Rail, P/W HUX XL Flash Hider, No BCG or CH, Black, M489UPPER-13.7-556-XL , MPN: M489UPPER-13.7-556-XL , UPC: 647535030029 , Code: 40W-UFH-556M4H-M489UPPER-13-7-556-XL
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 14.5in, 13.75in, Combat Barrel, M89 Rail, P/W NOX9 Flash Hider, No BCG or CH, Black, M489UPPER-14.5-556 , MPN: M489UPPER-14.5-556 , UPC: 785939519174 , Code: 40W-UFH-556M4H-M489UPPER-14-5-556
Sons of Liberty Gun Works Half Complete Upper Receiver, M4-89, 5.56mm, 13.7in, 13in, Combat Barrel, M89 Rail, P/W NOX9 Flash Hider, No BCG or CH, Black, M489UPPER-13.7-556 , MPN: M489UPPER-13.7-556 , UPC: 785939519167 , Code: 40W-UFH-556M4H-M489UPPER-13-7-556
Compare (0)
1 item has been added
Add at least two items to compare