AR-15 A3 Upper Receiver Assembly 5.56mm Left Hand

Name: AR-15 A3 Upper Receiver Assembly 5.56mm Left Hand
Brand: Stag Arms
Availability: OutOfStock

Stag Arms · Upper Receiver

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Best price

$129.99at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$129.99checked 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 27, 2026.

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Store	Latest	Lowest	Highest
Brownells	$129.99	$129.99	$129.99

Since Sep 27, 2026.

About this part

The AR-15 A3 Upper Receiver Assembly 5.56mm Left Hand is a 5.56 / .223 upper receiver from Stag Arms. One store lists it, Brownells at $129.99.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups

Specifications

Manufacturer: Stag Arms
Platform: AR-15
Caliber: 5.56 mm NATO

From the manufacturer

Build the Perfect Left Handed AR Upper at Home

Stag Arms’ Left Handed AR-15 A3 Flattop Upper Receiver Assembly is perfect for that left handed AR-15 that you have been thinking of building.

Stag makes sure to closely follow mil-spec standards in every possible way and makes sure to include an installed dust cover, and forward assist assembly that conformed to those same stringent standards.

Compatible with small .250” diameter pivot and takedown pins
Includes preinstalled dust cover and forward assist
Forged construction with black type 3 hard coat anodizing
Picatinny optics mounting rail

Stag Arms applies a type 3 hard coat anodizing to each Left Handed AR-15 A3 Flattop Upper Receiver Assembly to help it resist moisture and abrasion. The Left Handed AR-15 A3 Flattop Upper Receiver Assembly from Stag Arms is compatible with 5.56/.223 AR-15 barrels.