Assembled M4-89 300 AAC Blackout 13.9" Bbl 13" M89 Rail & Flash Hider

Name: Assembled M4-89 300 AAC Blackout 13.9" Bbl 13" M89 Rail & Flash Hider
Brand: Sons Of Liberty Gun Works
Availability: OutOfStock

Sons Of Liberty Gun Works · Upper Receiver

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Best price

$712.50at Brownells

Out of stock Sale checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$712.50Salechecked Oct 1, 2026	Out of stock	Buy at Brownells

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Dashed line = out of stock. Tracking since Sep 28, 2026.

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Store	Latest	Lowest	Highest
Brownells	$712.50	$712.50	$712.50

Since Sep 28, 2026.

About this part

The Assembled M4-89 300 AAC Blackout 13.9" Bbl 13" M89 Rail & Flash Hider is an AR-15 complete upper receiver from Sons Of Liberty Gun Works. One store lists it, Brownells at $712.50.

Fits and works with

Caliber: 300 Blackout · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Barrel length: 13.9" · Handguards
Handguard length: 13" · Barrels

Specifications

Manufacturer: Sons Of Liberty Gun Works
Type: Complete
Platform: AR-15
Caliber: 300 Blackout

From the manufacturer

The SOLGW M4-89 Upper Half comes with SOLGW's Combat Barrel and M89 Rail, and is available in 13.9" 300blk with NOX muzzle device. No BCG or C/H *13.9" barrels come pinned and welded flash hiders for OAL of 16"* Mfg: Sons Of Liberty Gun Works