BKF AR15 11.5″ 5.56 Nato 1/8 Twist QPQ GUNNER Barrel W/ 11.5″ FFSSR M-LOK Rail W/ KAK Mirco Flash Can (Faxon)

(12 customer reviews)


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This product is 100% Made in the USA! Our gas tubes, gas blocks and even roll pins are all proudly manufactured in the US.


  • BKF Dry Film Lubed Assembled Upper Receiver w/ T-Marks
  • Parallax Tactical Slim Profile 11.5″ Slim FFSSR M-LOK Handguard W/ QD Mounts 3 & 9 O’clock on Rear and front
  • Faxon  Firearms 11.5″ Big Gunner, 5.56 NATO, 1/8 Twist Mid-Length, 4150 QPQ
  • KAK Industries Slim Micro 1/2×28 Flash Can
  • .625 Low Profile Gas Block and Mid Length Gas Tube
  • Product comes assembled
  • No BCG or Charging Handle 

Standard Upper Features:

  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Upper is Assembled

 Parallax Tactical 11.5″ Slim M-LOK FFSSR

  • Super Slim Profile (1.360″) inside diameter
  • Lightweight design (9oz)
  • Free Floated
  • QD Swivel mounting holes at the 3 and 9 oclock positions at front and rear
  • Picatinny rails at the 3, 6 and 9 oclock positions
  • M-LOK Compatible
  • Made in the USA!!


Additional Info

Designed for those looking to save weight while still allowing for the use of a suppressor long-term, the BIG Gunner is ideal for suppressed shooters. All for just about a single pound!

Behind the gas block will be a Government profile tapering to a shoulder and 1.1″ journal .625 gas block. In front of the gas block, the barrel will continue straight to a 1/2×28 muzzle with full shoulder.

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.

Faxon manufactures all our barrels in Cincinnati, Ohio under our ISO:9001 and AS:9100  quality certifications.

  • Barrel Material: 4150 GBQ Steel
  • Barrel Type: Button Rifled
  • Barrel Caliber: 5.56 NATO*
  • Barrel Twist: 1:8
  • Barrel Length: 11.5″
  • Barrel Profile: BIG Gunner Hybrid
  • Barrel Gas System: Mid**
  • Inside Finish: QPQ Nitride
  • Outside Finish: QPQ Nitride
  • Muzzle Thread: 1/2-28 TPI (Threads Per Inch
  • Gas Block Diameter: .625″
  • Barrel Extension: M4
  • Barrel Weight: 1.14 lbs
  • Magnetic Particle Inspected!
  • 11-degree Target Crown

*As this barrel is likely to be used in full-auto applications, we are opting to stick with a 5.56 chambering to ensure absolute safety for our customers.

Additional information

Weight 3 lbs
Dimensions 20 × 4 × 4 in

12 reviews for BKF AR15 11.5″ 5.56 Nato 1/8 Twist QPQ GUNNER Barrel W/ 11.5″ FFSSR M-LOK Rail W/ KAK Mirco Flash Can (Faxon)

  1. tehardman (verified owner)

    I decided to do a pistol build and ordered this complete upper opposed to building from scratch. The price point is outstanding and the quality of the delivered upper is top notch. Best bang for your buck in my opinion.

  2. recollins1 (verified owner)

    Like the other review stated, I also decided to do a pistol build and have spent over a year looking for an upper that had everything I was looking for at a reasonable price. I just received this upper today (2/5/18) and it’s far better than I expected. The fit and finish is spot on and really completes the look I was going for. It’s comfortable in the hands and shoots well. Thank you guys for such a fantastic upper, I can’t recommend this enough!

  3. Tom Hardman (verified owner)

    Very happy with the product and shipping was prompt.

  4. Russell Streich (verified owner)

    Great product at a great price!

  5. Jarrett Judson (verified owner)

    The pictures do not do this upper justice. This thing is beautiful and at this price nothing is comparable for value and quality

  6. Colten (verified owner)

    Well put together, quality products used. Shoots great.

  7. Jarrett Judson (verified owner)

    Love this upper. Pics do it no justice!

  8. Jason G. (verified owner)

    Haven’t shot it yet but came together nicely. Everything was tight and had a nice fit and finish.

  9. curtis d. (verified owner)

    Handles and balances well. Very nice, and a good value.

  10. William (verified owner)

    Very pleased with the quality of this upper.

  11. Greg K. (verified owner)

    BKF offers complete uppers like this at a smokin price which is why I’ll be a long term customer. Great set up for a nasty little pistol build!

  12. Paul A. (verified owner)

    I can’t wait to try this out! Bkings was wonderful to buy from, and I will be ordering from them again.

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