T.REX Criterion Barrel Kit - CORE, KAK Enhanced (Carrier Only), 13.9"

Name: T.REX Criterion Barrel Kit - CORE, KAK Enhanced (Carrier Only), 13.9"
Brand: T.Rex Arms

T.Rex Arms · Barrels

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Best price

$650.00at T.Rex Arms

checked Oct 22, 2026

Buy at T.Rex Arms

Where to buy

Store	Price	Availability	Buy	Add to build
T.Rex Arms	$650.00checked Oct 22, 2026	Check store	Buy at T.Rex Arms

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 T.REX Criterion Barrel Kit - CORE, KAK Enhanced (Carrier Only), 13.9" is a 13.9" 5.56 / .223 barrel from T.Rex Arms. One store lists it, T.Rex Arms at $650.00.

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: 13.9" · Handguards

Specifications

Manufacturer: T.Rex Arms
Platform: AR-15
Caliber: .223 Wylde
Barrel length: 13.9"

From the manufacturer

Chrome-lined 4150 CrMoV barrel kit with .223 Wylde chamber for accuracy and durability. Includes KAK bolt carrier, BCM bolt, gas block, and installation supplies.