16" Pencil, 5.56 NATO, Mid-Length, 4150 QPQ

16" Pencil, 5.56 NATO, Mid-Length, 4150 QPQ

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Faxon pencil barrels are the lightest in the industry. Don't take just our word for it, major companies like Robar, Kaiser US, 2A Armament, and others choose Faxon pencils for their ideal balance of weight and performance. 

Faxon Firearms barrels are the pinnacle of value. Manufactured 100% in-house from cradle-to-grave, these barrels are fully stress relieved, air-gauge tested, and 11 degree target crowned to ensure superior accuracy. 

Quality is imbued into our barrels from the start. We start with the best materials, either certified 4150 Mil-Spec steel or 416-R Stainless. From there, each barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. All barrels are individually checked for headspace by precision custom hardened gauges. 

  • Barrel Material: 4150 CMV Steel
  • Barrel Type: Button Rifled 
  • Barrel Caliber: 5.56
  • Barrel Twist: 1:8
  • Barrel Length: 16”
  • Barrel Profile:  Pencil
  • Barrel Gas System: Mid
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread: 1/2-28
  • Gas Block Diameter: .625" 
  • Gas Block Journal Length: 1.1"
  • Barrel Extension: M4 
  • Weight:  1.20  lbs
  • Magnetic Particle Inspected!
  • 11-degree Target Crown


Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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  • Great Barrel, Within 1/2 MOA Precision, Light Weight

    Posted by HHM, Pahrump, NV on Jan 30th 2017

    Used this Pencil Profile barrel plus the corresponding gas block and gas tube offered from Faxon on 4 builds by now - absolutely love them. This barrel is is the finishing touch of a 5.6 lbs. AR 15 build for my wife and "we" love it. Light weight, very precise and helps with the overall balance of her rifle. Very light upfront with most of the weight perfectly centered. I can definitely recommend this product

  • Super Light and Accurate!

    Posted by Jarrod Cook on Jan 12th 2017

    This is my second pencil profile barrel from Faxon, the first has 3,000+ rounds through it and still shoots 1 MOA. Be sure to follow the break in procedure. If you are building an ultralight AR, this barrel is perfect...

  • Fantastic Pencil Barrel

    Posted by Unknown on Nov 28th 2016

    I bought this barrel for a lightweight/home defense build (~6.5 lbs fully decked out). The fit and finish was great. The only think I wish is that there was an option to have the barrel dimpled for the gas block I also bought from Faxon, Please do this!!! Or if you'd sell a gas block jig so I can sweat a little less when I have to dimple the barrel myself.

    The end product I built is a great shooter and pretty accurate for what it is. No problems with any of the ammunition that I've used with it thus far. Definitely love this barrel and I'm looking forward to using more of Faxon's barrels in the future.

  • This barrel makes a poor shooter look like and Gold Medal Olympian

    Posted by David D. on Nov 9th 2016 on Nov 9th 2016

    I recently got a system from Faxon. It’s an AR15 which consisted of a 16” pencil barrel, their new flash hider/ compensator, the Holding Upper and lower, a Faxon bolt carrier assy and a Hyperfire trigger.
    I took it to the range today and shot 5 rounds through it to get it close, I was using a Nikon 3-12x42 power scope shooting at 100yards. I put up a target and took my first shot. Made a quick windage and elevation adjustment then fired 4 consecutive rounds. I had 2 bullseyes and 2 just off dead center. The grouping was 0.950”, the ammo was cheap 30 cent a round Winchester 5.556/.223 ammo in the white box from Field and Stream. I was just laying the gun on my range bag

    Imagine what a good shooter, using match ammo and on sand bags could do. I bet you would hold 1/2MOA

    Thanks Faxon!

  • 16" PENCIL, 5.56 NATO, MID-LENGTH, 4150 QPQ

    Posted by AD on Jul 26th 2016

    Barrel head spacing was correct.
    Barrel length was correct.
    Muzzle threads were correct and crisp.
    Barrel extension was correct.
    Gas port was properly sized for mid-length gas system and located correctly.
    Finish was complete and nice.

    Notes: All in all this is a great barrel, super light, correct to specifications. The value of this barrel is also another great point. I have used more expensive barrels that have the same attention to detail and workmanship as this one. The barrel is surprisingly accurate for its weight and the reduced rigidity found in pencil barrels. would recommend for use.

  • wonderful barrel

    Posted by Unknown on Jul 8th 2016

    This barrel is everything I expected, finish is flawless, markings are sharp and clear, and the inside of the barrel was beautiful upon arrival. I just finished my first range day with this barrel and I couldn't be happier, it groups tighter than me when I shoot offhand, it does heat up quick but it is so skinny it is to be expected. I doubt I will ever look anywhere else to buy a barrel for myself in the future. Wonderful product

  • lightweight build

    Posted by jim from TX. on Jun 27th 2016

    Wanted to do a lightweight build, heard about Faxon Firearms pencil barrel and talked to friends who use them. I was not disappointed, used with BCM Kmr 15" forearm it turned out fabulous. My wife shot it after I sighted in irons and red dot. "Thanks for my new ar honey, it's so much lighter than mine"! Yes dear your welcome.

  • best barrel for the money

    Posted by Greg McComb owner Maximum Ammunition LLC on Jun 7th 2016

    I'm building a light weight rifle and the pencil barrel was what I needed. Faxon has the lightest pencil barrel at a great price. I'm very happy with my purchase.

  • Good barrel

    Posted by Matt on May 15th 2016

    So far I am impressed with this barrel. It is nice and light, exactly what I was looking for. Everything is a perfect fit when paired with the Faxon low profile gas block and gas tube. As far as accuracy: when in my untrained, hobbyist hands, I put 30 rounds of American Eagle 5.56 55gr FMJ all center mass at 100 yards with iron sights, good enough for me. I definitely recommend this product and will return to Faxon on future builds.

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