10.5" Upper Assy 5.56 M4 Standard KeyMod Rail No BCG Or CH

Best price

$332.13at Brownells

checked Sep 30, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$332.13checked Sep 30, 2026	Check store	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.

About this part

The 10.5" Upper Assy 5.56 M4 Standard KeyMod Rail No BCG Or CH is a 10.5" 5.56 / .223 upper receiver from Radical Firearms. One store lists it, Brownells at $332.13.

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: 10.5" · Handguards

Specifications

Manufacturer: Radical Firearms
Platform: AR-15
Caliber: 5.56 mm NATO
Barrel length: 10.5"
Length: 5

From the manufacturer

The Radical Firearms 10.5" M4 Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver provides a high-quality upper for any level budget or shooter. Comes complete and assembled with Upper Receiver, Forward Assist, Ejection Port Door, Barrel Nut. 10.5" M4 Profile Barrel and A2 Flash Hider. Bolt Carrier Group and Charging Handle are not included.