Length Brn XM177E2 5.56mm 12.7" Bbl 1-7 Twt Upper Pin/Weld W/4x21mm

Name: Length Brn XM177E2 5.56mm 12.7" Bbl 1-7 Twt Upper Pin/Weld W/4x21mm
Brand: Brownells Bundles
Availability: OutOfStock

Brownells Bundles · Upper Receiver

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Best price

$1,025.99at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$1,025.99checked 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	$1,025.99	$1,025.99	$1,025.99

Since Sep 28, 2026.

About this part

The Length Brn XM177E2 5.56mm 12.7" Bbl 1-7 Twt Upper Pin/Weld W/4x21mm is a 12.7" 5.56 / .223 upper receiver from Brownells Bundles. One store lists it, Brownells at $1,025.99.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Barrel length: 12.7" · Handguards

Specifications

Manufacturer: Brownells Bundles
Platform: AR-15
Caliber: 5.56 mm NATO

From the manufacturer

Based on popular carbine configurations, these XM177E2 Upper Receivers are ready for your next Retro build. The muzzle of the XM177E2 Upper Receiver, is capped by the classic XM177E2 moderator inspired flash hider, with ports around its radius. This muzzle device is a flash hider, unlike the original XM177 muzzle device, which was technically a suppressor. The flash hider is attached to a lightweight 11.5 or 12.7 inch barrel. Why 12.7 inch? The 12.7 inch model has its muzzle device pinned and welded in place, allowing the overall length of the barrel to reach the required 16" for a rifle. Barrels are available with a 1-12 or 1-7 twist. Se Mfg: Brownells Bundles