BKF AR15 16″ 5.56 Nato Govt 1/7 Twist 4150 Barrel W/ 17.5″ FFSSR M-LOK Rail W/ KAK Flash Can

(18 customer reviews)


Out of stock

Email when stock is available


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 Assembled Upper Receiver w/ T-Marks
  • Parallax Tactical Slim Profile 17.5″ Slim FFSSR M-LOK Handguard W/ QD Mounts 3 & 9 O’clock on Rear and front
  • 16″ 4150 barrel in 556 Nato W/ Carbine Length Gas system and 1:7 TWIST
  • .750 Low Profile Gas Block and carbine Length Gas Tube
  • KAK Industries Slimline Flash Can
  • 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 17.5″ Slim M-LOK FFSSR

  • Super Slim Profile (1.360″) inside diameter
  • Lightweight design (12oz)
  • 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

Caliber – 556 Nato

Barrel Length – 16″

Barrel Material – 4150 Chrome Moly Vanadium

Finish – parkerized

Profile – m4

Gas System Length – carbine

Gas Block Journal – .750″

Twist Rate – 1:7 inches

Muzzle – 1/2×28 Threaded

Total Weight of Upper Receiver without BCG – 4lb 1oz

Additional information

Weight 4 lbs
Dimensions 28 × 4 × 4 in

18 reviews for BKF AR15 16″ 5.56 Nato Govt 1/7 Twist 4150 Barrel W/ 17.5″ FFSSR M-LOK Rail W/ KAK Flash Can

  1. Leonard Fleishans (verified owner)

    I was very happy with apprentice , and timely delivery

  2. Todd Hertweck (verified owner)

    Upper was well built and fast shipping and one more thing U.S.A. made and veteran owned

  3. Joseph P. (verified owner)

    I made mistakes when ordering and b.kings contacted me and helped me and guided me in the right direction. Very happy with end product. Would order from again. Excellent customer service and products.

  4. Suzannah (verified owner)

    Great Product! No complaints!

  5. Scott Simmons (verified owner)

    Super awesome upper assembly, I couldn’t be more pleased… Everything was properly torqued & all I did was pin it on my freshly completed lower, lube the BCG, slap it and the charging handle in & it functioned flawlessly from the first shot & still not a single issue over 1000 rounds through it. Great price too. I love it… Thanks Blake & everyone at B. King’s

  6. Ryan M. (verified owner)

    Dream to shoot and best looking AR I own. This was the final piece to my first build and couldn’t be happier. Shipping was quick with no hiccups. Will be using B Kings for future builds.

  7. Joegay1571 (verified owner)

    I had heard nothing but positives about products and service from BK and I couldnt be happier. Matches the finish of my lower perfectly. Range day this coming saturday and if it functions even half as good as its appearance its a win for both me and BKings. Already planning my next build and I will def be a repeat customer. Another positive is owned and operated by an American Veteran. Keep up the good work guys!

  8. Joseph Gay (verified owner)

    Fit and finish were outstanding. Shoots very well..will be a return customer. Couldnt be happier

  9. Mark (verified owner)

    Very Happy. Excellent product and service. I made a Great choice. Thank you B. King’s.👍

  10. Steven L. (verified owner)

    Great work, definitely look forward to using more of your parts on more builds

  11. wernerb81 (verified owner)

    Great product, just what i was looking for to upgrade my Ar
    Fast delivery!!

  12. Nick Haas (verified owner)

    Very satisfied with the assembled upper reciever I purchased

  13. John Neal (verified owner)

    Product arrived super quick and has made a nice addition to my growing collection. Definitely will be doing business with B. Kings again.

  14. Tim F. (verified owner)

    Fast shipping and a high quality upper for a great price, all things considered. I recommend these guys over the competition!

  15. Scott V. (verified owner)

    Great looking and feel shoots awesome

  16. Anonymous (verified owner)

    Came fast, and in perfect shape. I’ll be buying parts from you again!

  17. Nick (verified owner)

    BKF is a solid well built machine. My assembled upper was delivered lightning fast and the quality is awesome. Will be purchasing more products in the future.

  18. Jacob W. (verified owner)

    Arrived fast and looks bad***!

Only logged in customers who have purchased this product may leave a review.