BKF AR15 7.5″ 5.56 Nato 1/7 Twist 4150 Barrel W/ 7.25″ Hybrid M-LOK Rail W/ BKF BFD

(48 customer reviews)


Out of stock


This product is 100% Made in the USA! Our gas tubes, gas blocks and even roll pins are all proudly manufactured in the US. All Complete uppers are headspaced prior to shipping and test fired.


  • BKF Assembled Upper Receiver w/ T-Marks
  • Parallax Tactical Slim Profile 7.25″ Slim M-LOK Handguard W/ DQ mounts at 3 and 9 O’clock at the rear
  • BKF 7.5″ 4150 DRP Nitride barrel in 5.56 Nato W/ Pistol Length Gas system and 1:7 TWIST
  • BKF 1/2-28 Blast Forwarding device 1.75″
  • BKF .750 Low Profile Gas Block and Pistol 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 7.25″ Slim Hybrid M-LOK

The Super Slim Hybrid M-LOK by Parallax Tactical is a free floating, extremely durable, drop in rail for your rifle.  Utilizing the brand new Magpul M-LOK standard with strict adherence to Magpul’s technical specifications, this rail system is guaranteed to work with officially licensed M-LOK acessories.

The Lightweight FFSSR Hybrid series rail is a Hybrid of the minimalist rail, having removed the QD cups and extra bulk from the front versions of the FFSSR.

The FFSSR Hybrid is made to be durable, simple, and extremely easy to machine.  This durable free floating rail is one of the most affordable on the market as a result.

  • Made from Aluminum
  • Finished in Type III HardCoat Anodizing
  • Steel Barrel Nut finished in Black Nitride for corrosion resistance
  • Grade 8 Fasteners
  • Timing shims included
  • 1.30″ internal diameter
  • 1.60″ outside diameter
  • M-LOK slots at the 3, 6, and 9 o’clock sides
  • QD at Rear 3 and 9 o’clock positions
  • 6oz

Additional Info

Caliber – 5.56 Nato

Barrel Length – 7.5″

Barrel Material – 4150 Chrome Moly Vanadium

Profile – DRP

Finish – Nitride

Gas System Length – Pistol

Gas Block Journal – .750″

Twist Rate – 1:7 inches

Muzzle – 1/2×28 Threaded

All NFA/ATF Rules Apply
You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when permanently attaching a muzzle device extending the length to 16 inches.

PRODUCT SKU: BKF-7.5-556-7.25H-BFD

Additional information

Weight 3 lbs
Dimensions 20 × 4 × 4 in

48 reviews for BKF AR15 7.5″ 5.56 Nato 1/7 Twist 4150 Barrel W/ 7.25″ Hybrid M-LOK Rail W/ BKF BFD

  1. Anonymous (verified owner)

    Great upper. Great Service. Highly recommend to everyone

  2. karl berry (verified owner)

    Product exceeded my expectations, fast shipping, unbeatable prices. I will be a customer for life.

  3. Joseph Williams (verified owner)

    I was very pleased with the product itself and the very speedy shipping and careful packaging, needless to say it spoke for itself after the build because of now two of my co-workers have ordered from Blake King and they are getting me to build a pistol for them as well.

  4. Anonymous (verified owner)

    Great price, great service!

  5. Jerry (verified owner)

    I love it, and fast shipping, I’ll be ordering again!

  6. barry (verified owner)

    processed very fast and not price gouging like everyone else rite now. thanks and will purchase again very soon!

  7. Maynard (verified owner)

    Great product a very great price! Only wished you had more product in stock!

  8. Jamie L. (verified owner)

    Great quality, nice price point, fast shipping. Very pleased! Definitely will purchase from BKF again!

  9. Miguel (verified owner)

    I really like this complete upper. Reliable. Plus its affordable for the price.

  10. Daniel Brennan (verified owner)

    I had a little trouble manuvering through the site, so I called, the gentleman I talked to walked me through it, I am very happy with your product and after I go to the range and site in, I will be making another purchase in the near future. Thanks again,
    Dan Brennan

  11. Maynard M. (verified owner)

    Always the best!

  12. Julian (verified owner)

    Great product fast shipping definitely will keep in the books for future needs again!

  13. Wesley (verified owner)

    This is my first purchase as far as upper receivers go, but it looks great. Good price, fast shipping. I’ve already gone ahead and purchased more parts for my AR. Definte 5 Star rating on all fronts.

  14. Anonymous (verified owner)

    I’m very satisfied with this upper after sighting in a 36 yard zero with a group the size of a half dollar. This won’t be the last upper I buy from BKings.

  15. DANIEL L. (verified owner)

    Good quality, Great price. Satisfied.

  16. Maynard M. (verified owner)

    The best as always!

  17. Christopher E. (verified owner)

    SICK!!!! Will definitely be ordering again.

  18. Christopher S. (verified owner)

  19. Jacob Davis (verified owner)

    Awesome easy product

  20. Kyle (verified owner)

    Shipped fast, and looks great!

  21. Patrick (verified owner)

  22. Jason White (verified owner)

    Excellent product awesome shipping and great communication!

  23. John Griffiss (verified owner)

    Very nice upper assembly and the price is even better. Shoots great only problem Is the dust cover door was very hard to close like almost impossible. But I took care of that with a small file. Overall a good product. Fast shipping as well.

  24. Tyler D. (verified owner)

    Had some trouble with my payment going through and emailed these guys and got an instant response! They helped me figure everything out and shipped my part super fast. Couldn’t find these parts ANYWHERE ELSE in stock

  25. Miguel P. (verified owner)

    Order came in very fast. This is my second one purchased. Will definitely use you guys again.

  26. Jason Costa (verified owner)

    Quick shipment and high quality item. I’m very happy with purchase.

  27. Michael M. (verified owner)

    Looks great, great quality. Only put 100 rounds through it so far, but have faith it’s going to be a great upper.

  28. Andrew C. (verified owner)

    I was a little apprehensive at first as I had never heard of B.K firearms but I immediately liked there website as it was simple with accurate in stock numbers that are updated constantly.
    I first ordered the 10.5” fssr parallax and was so impressed that I then ordered the same but in 7.5”.
    Very impressed with build quality and function.
    I haven’t fired the 7.5” yet but a friend purchased the exact same product and based on a conversation with Blake(the owner) who advised using an H2 buffer and spring, there were no jams, miss feeds or cycling issues and all casings were ejected at the 4 o’clock position…perfect!
    Keep up the good work Blake and team, fantastic job and fantastic product.
    I highly recommend these products!

  29. Anonymous (verified owner)

    Very well made and looks great. This is my 5th AR and this upper is as good as any other I have seen.

  30. Matthew Sample (verified owner)

  31. Peter (verified owner)

    Good quality piece. Looks great and fires very nice!

  32. Steve (verified owner)

    Absolutely solid ! Great communication! Great service! Quick delivery!

  33. Jonathan (verified owner)

    Very Nice Quality! Great price!

  34. Tyrone W. (verified owner)

    Once the order processed the shipping was fast. Really good quality upper and some of the best prices around. I’ll definitely be a returning customer.

  35. Rich Rodriguez (verified owner)

    Extremely happy w/ my purchase! Solid craftsmanship. Great addition to my collection. Made this Marine happy, Semper Fi!! Thank you!

  36. G W. (verified owner)

    Another great upper assembly.

  37. Benjamin Bradley (verified owner)

    I was looking for a 7.5″‘ upper to compete a backpack project. The hybrid 1913-MLOK hand guard was perfect for attaching accessories and still keeping it slim enough to insert and remove from a pack without issue. Now I am looking forward to doing another one in 300 blackout.

  38. Michael S. (verified owner)

    Very nice AR15 upper. Just waiting to try it out!

  39. Brett Stevens (verified owner)

    Very well made
    definitely would buy again!
    Fits perfectly with no struggling
    Have not tested yet but functional wise works great!

  40. Richard Wilson (verified owner)

    Solid, quality, and looks great

  41. Casey S. (verified owner)

    Great product, Awesome Customer service!

  42. Scott (verified owner)

  43. Mike A. (verified owner)

  44. Stephan W. (verified owner)

    Good deal, fits perfect

  45. Jim (verified owner)

    Good value and fast shipping

  46. Michael M. (verified owner)

    Great deal

  47. Deward Hendrix (verified owner)

  48. Pedro R. (verified owner)

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