AR-15 M4 Barrel Extension Steel Unfinished

Name: AR-15 M4 Barrel Extension Steel Unfinished
Brand: Whitworth Tool, Inc.
Availability: OutOfStock

Whitworth Tool, Inc. · Upper Parts

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Best price

$27.99at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$27.99checked Oct 1, 2026	Out of stock	Buy at Brownells

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

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Store	Latest	Lowest	Highest
Brownells	$27.99	$27.99	$27.99

Since Sep 28, 2026.

About this part

The AR-15 M4 Barrel Extension Steel Unfinished is an AR-15 upper part from Whitworth Tool, Inc.. One store lists it, Brownells at $27.99.

Specifications

Manufacturer: Whitworth Tool, Inc.
Platform: AR-15

From the manufacturer

Economical, high-quality M4 barrel extension is machined to mil-spec standards with integral feed ramps and predrilled locator pin hole for fast, easy barrel installations. Machined from 8620 steel and head-treated for additional surface hardness to resist erosion by hot combustion gases for years of reliable service. Great for custom barrel jobs and caliber conversions. Mfg: Whitworth Tool SPECS: 8620 steel, in-the-white. .8125"-16UNF thread. Barrel locator pin required, not included.