R-One M4E1 5.56 Assem Upper Govt 11.5" Bbl Carbine Threaded FDE

Name: R-One M4E1 5.56 Assem Upper Govt 11.5" Bbl Carbine Threaded FDE
Brand: Aero Precision
Availability: OutOfStock

Aero Precision · Upper Receiver

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Best price

$484.99at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$484.99checked 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 28, 2026.

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Store	Latest	Lowest	Highest
Brownells	$484.99	$484.99	$484.99

Since Sep 28, 2026.

About this part

The R-One M4E1 5.56 Assem Upper Govt 11.5" Bbl Carbine Threaded FDE is an AR-15 complete upper receiver from Aero Precision. One store lists it, Brownells at $484.99.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Gas system: Carbine · Handguards
Barrel length: 11.5" · Handguards

Specifications

Manufacturer: Aero Precision
Color: Flat Dark Earth
Type: Complete
Platform: AR-15
Caliber: 5.56 mm NATO

From the manufacturer

This assembled upper includes Aero Precision's new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Their proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. INCLUDES: M4E1 Threaded Assembled Upper Receiver - Anodized Black or Cerakote FDE depending on model. 15" ATLAS R-ONE M-LOK Handguard with 16"CMV Barrel OR 15" ATLAS R-ONE M-LOK Handgua Mfg: Aero Precision