AR-15 M4-76 Upper Receiver 5.56 16" M-LOK Black

Name: AR-15 M4-76 Upper Receiver 5.56 16" M-LOK Black
Brand: Sons Of Liberty Gun Works
Availability: OutOfStock

Sons Of Liberty Gun Works · Upper Receiver

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Best price

$588.42at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$588.42checked 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	$588.42	$588.42	$588.42

Since Sep 28, 2026.

About this part

The AR-15 M4-76 Upper Receiver 5.56 16" M-LOK Black is an AR-15 complete upper receiver from Sons Of Liberty Gun Works. One store lists it, Brownells at $588.42.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Barrel length: 16" · Handguards
Handguard length: 16" · Barrels

Specifications

Manufacturer: Sons Of Liberty Gun Works
Color: Black
Type: Complete
Platform: AR-15
Caliber: 5.56 mm NATO

From the manufacturer

Sons of Liberty Gun Works and Brownells have teamed up to bring you this rugged and ready AR-15 16" M4-76 Upper Receiver The M4-76 upper receiver has a 16" barrel made from 4150 chrome moly vanadium that has been high pressure tested and magnetic particle tested. The barrel has a Mid-Length gas system, a 1-7 rate of twist, and a muzzle threaded A 1/2-28. The M4-76 upper receiver uses the 15" SOLGW M76 Wedge Lock Rail which accepts M-LOK attachments and features a steel barrel nut. The M4-76 16" Upper Receiver comes to you without a bolt carrier group, charging handle, or muzzle device knowing that for many customers these are some of the most s Mfg: Sons Of Liberty Gun Works