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Faxon Firearms AR-15 SAAMI Rifle Barrel FX5500-U Caliber: 5.56x45mm NATO, Barrel Length: 14.5 in, 19% Off, Blazin' Deal w/ Free S&H

Faxon Firearms AR-15 SAAMI Rifle Barrel, 9mm, 4.5in, Light Tapered, No Gas Port, 4150 QPQ, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
Faxon Firearms AR-15 SAAMI Rifle Barrel, 9mm, 4.5in, Light Tapered, No Gas Port, 4150 QPQ, FX5500-U
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Faxon Firearms AR-15 SAAMI Rifle Barrel, 9mm, 4.5in, Light Tapered, No Gas Port, 4150 QPQ, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
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Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
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Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
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Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U
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Faxon Firearms Ultralight 5.56 Upper Receiver Group, FX5500-U

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Questions & Answers
Co-witness iron sights and optics/lasers* *Requires optional low-profile M-LOK rail adapters. Where can I find this low profile mlok rail adaptor? Expert Answer

You would be able to use any M-Lok to picatinny rail adapter such as the TRYBE Defense Magnite M-LOK Picatinny Rail Sections, found by using the link below:
https://www.opticsplanet.com/trybe-defense-magnite-m-lok-picatinny-rail-section-3-slots.html

by Ethan, Gear Expert, October 4, 2022
See 2 More Answers
Does the muzzle device pinned and weld ? Manufacturer Answer

The muzzle device is integral and machined into the end of the barrel and cannot be removed. It is permanently affixed making the legal length of the barrel 16.1 inches.

by Faxon Firearms, Manufacturer, July 2, 2025
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Easy to handle by gunsult, Verified Owner, October 29, 2023
As you see this upper is super lightweight. If you are tactical shooter and 3gun shooter, you will love it. Also I was using cheapest reloaded ammo.... just 1MOA in 100 yards. 1. super ultra lightweight 2. 1MOA, 100 yards, with cheapest reloade...
Read More...
1/1 found this helpful
Helpful Positive Review
description by AA, Verified Owner, September 15, 2024
The description for this listing is incorrect. This is NOT a 9mm upper. This is a 5.56 NATO upper which has been lightened with a pencil profile barrel with integrated muzzle brake, skeletonized BCG and brass deflector and carbon fiber handguard. It ...
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1/1 found this helpful
Read All 2 Reviews

Let's Start Celebrating Already! Save up to 20% on Faxon Firearms Products

See promotional details
Blazin' Deal
Prices have been cut drastically on this product as part of a special offer. These prices are so low that there's no double-dipping with coupons or any additional discounts, but you'll still get the best deal out there. This offer won't last long, so don't miss out!
Caliber:
5.56x45mm NATO
Barrel Length:
14.5 in
Muzzle Device:
Slim 3-Port
Finish:
Anodized
Color:
Black
Handguard Length:
13 in
Condition:
New

Code: 11I-URC-FF207-FX5500-U

MPN: FX5500-U

UPC: 816341024557

Blazin' Deal
List: $1,099.00Save 20%
$879.64
Purchase Restrictions Purchase Restrictions

ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

Product Info for Faxon Firearms AR-15 SAAMI Rifle Barrel

FX5500-U features our 14.5in Pencil Barrel with a permanently attached Slim 3-Port Muzzle Brake which meets the NFA 16in minimum barrel length requirement, 13inStreamline Carbon Fiber Handguard, and Lightweight Bolt Carrier Group. Super light, easy shooting and ultra-rugged, the FX5500-U never compromises strength for weight. Pop two pins and shave more than 1 lb off the weight of your AR15! Upper Receiver: 5.56 NATO 14.5in Pencil Barrel w/ Welded 3-Port Brake - meets NFA 16in minimum barrel length requirement Faxon Enhanced Forged Upper Receiver Faxon 13in Carbon Fiber M-LOK Handguard Faxon Gunner Lightweight Bolt Carrier Group Multi-Position Adjustable Gas Block Radian Weapons Raptor LT Ambi Charging Handle Weight. 3.1 lbs When compared to an upper receiver with Socom profile barrel, aluminum handguard, and full mass BCGimage

WARNING: California`s Proposition 65

Specifications for Faxon Firearms AR-15 SAAMI Rifle Barrel:

Manufacturer: Faxon Firearms
Caliber: 5.56x45mm NATO
Barrel Length: 14.5 in
Muzzle Device: Slim 3-Port
Finish: Anodized
Color: Black
Model: FX5500-U
Handguard Length: 13 in
Gun Type: Rifle
Gun Make: AR Platform
Gun Model: AR-15
Magazine Included: No
Condition: New

Package Contents:

  • Faxon Firearms AR15 Upper Receiver Groups

What firearm models does the manufacturer say Faxon Firearms AR-15 SAAMI Rifle Barrel is compatible with?

The manufacturer says that Faxon Firearms AR-15 SAAMI Rifle Barrel is compatible with AR-15

Faxon Firearms AR-15 SAAMI Rifle Barrel Orderable Models

List of Orderable Models

  • Faxon Firearms AR-15 SAAMI Rifle Barrel, 9mm, 4.5in, Light Tapered, No Gas Port, 4150 QPQ, FX5500-U , MPN: FX5500-U , UPC: 816341024557 , Code: 11I-URC-FF207-FX5500-U
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Last updated 2026-06-17 UTC.