Faxon ION Ultralight 5.56 Rifle

(5 reviews)
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The Faxon ION Ultralight 5.56 Rifle is a high-performance rifle that's built to meet the needs of today's competitive shooters and firearm enthusiasts. This rifle is designed to be ultra-lightweight and easy to handle, making it ideal for long-range shooting and precision target practice.

One of the standout features of the Faxon ION Ultralight 5.56 Rifle is the patented Integral Muzzle Device Pencil Profile Barrel. This innovative design combines a pencil-thin barrel profile with a built-in muzzle device, resulting in a barrel that's incredibly lightweight and offers exceptional accuracy and recoil reduction.

In addition to its lightweight and accurate barrel, the Faxon ION Ultralight 5.56 Rifle features a number of other high-performance components. It comes equipped with a Faxon Gunner Lightweight M16 Bolt Carrier Group, Carbon Fiber M-LOK Handguard, and an adjustable gas block, among other features.

But what really sets the Faxon ION Ultralight 5.56 Rifle apart is its exceptional quality and attention to detail. Made in-house at Faxon's Greater Cincinnati, Ohio facility, this rifle is crafted from top-quality materials and machined to exacting standards. It's designed to deliver superior performance and longevity, making it an excellent investment for any serious shooter.

And like all Faxon products, the ION Ultralight 5.56 Rifle is backed by Faxon's Lifetime Guarantee. This guarantee covers any defects in materials or workmanship for the life of the product, giving you peace of mind and protecting your investment.

Overall, the Faxon ION Ultralight 5.56 Rifle is an exceptional choice for anyone looking for a high-performance, ultra-lightweight rifle. With its patented Integral Muzzle Device Pencil Profile Barrel, superior quality components, and lifetime guarantee, the Faxon ION Ultralight 5.56 Rifle is an excellent investment for any serious shooter.


Faxon Firearms has long been known for bringing quality and value to our customers when it comes to purchasing parts for their rifle builds. Faxon is taking things to the next level and bringing that same quality and value to the modern sporting rifle market.

Backed by the Faxon Lifetime Guarantee, our rifles fall into two distinct groups; the First Line and the Summit Line. Are you a first-time buyer, or in search of a value priced rifle offering? Check out the First Line. Looking for a more specialized rifle configuration for competition, training, or defensive use? The Summit Line is for you!

The Faxon Ion Rifle is the most affordable production ultralight AR15 on the market. Weighing in at just under 5 lbs, the Ion Ultralight AR15 is the perfect choice for any customer looking to step into the competition world, or for those who just enjoy the soft recoil of a finely tuned lightweight rifle. As part of Faxon's Summit Line, the Ion comes from the factory with a whole slew of out-of-the-box upgrades, including a tuned gas system, Gunner lightweight bolt carrier group,  ambi charging handle & safety selector, Hiperfire EDTDM trigger, and more!

Faxon's Ion Ultralight Rifle (FX5500):

  • 16" 556 Integral Barrel with 3-Port Brake - Meets NFA 16" minimum barrel length requirement 
  • Enhanced Forged Receiver Set w/ Tensioning Screw
  • Gunner Lightweight BCG w/ Superfinish
  • 13" M-LOK Carbon Fiber Handguard
  • Multi Position Adjustable Gas Block
  • Hiperfire EDTDM Single Stage Trigger
  • Ambi Charging Handle 
  • Radian Talon Ambi 45/90 Degree Safety Selector
  • MFT Minimalist Stock or similar
  • Magpul MOE® Grip or similar
  • Mid Length Gas System

Complete Rifle Weight: 4.95 lbs

Note- Each rifle will be individually test fired & tuned with factory new 55gr 5.56 Nato ammunition. 


Click HERE for product manuals.


Note: Cannot be shipped to CA, CT, DC, HI, IL, MD, MA, NJ, or NY state



  • 5
    Faxon ION Ultralight 5.56 Rifle

    Posted by Delbert Gideon on Sep 21st 2023

    Sweet shooting firearm. If you are an older shooter and the weight of standard 5.56's becomes too much, this is the platform for you. Super light (4.95 pounds), accurate, and just fun to shoot.

  • 5
    Great rifle

    Posted by Dustin on May 9th 2023

    Pros: lightweight and operates perfectly. Cons: it ate my ammo.

  • 5
    great rifle---but loud!

    Posted by GP on Mar 7th 2023

    just as advertised! this thing is SOOO light compared to my other ARs! had an issue with my front takedown pin (the spring)...caused me a real issue...Jesse T. with customer service was amazing! returned all my emails and advised me to send the rifle back...they ended up building me a brand new lower!!! a week later, I was back in business! thanks Jesse! this thing is REALLY loud though...make sure you invest in some good ear protection! :) solid firearm all around so I would definitely recommend!!!

  • 5
    The best AR-15 I've shot and the star of shoot day

    Posted by David Neuhaus on May 9th 2022

    Shoot day is fun for the whole family, but there is always a few of the smaller folks like moms or wives that wish they could enjoy the 223/556 rifles. Now they can. Mothers day ended up with mom advance requesting this as her next/main shooter. Didn't think she'd ever get tired of the hitting the gongs and she's never been more accurate/consistent/fast! Light weight made it so easy for her to hold and shoot. Standing, sitting, bench and the brake made it gentle enough too.... I'll write off all the ammo as a mothers day gift ;)

  • 5

    Posted by Brett on May 5th 2022

    Fantastic AR. Lighter than you can imagine. Shoots great and groups tight. Very good fit and finish. No complaints here. Thanks Faxon for a great First Responder discount.