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BKF M4 MOD-0 Assembled Upper Receiver – Black (Light T-Marks)

(30 customer reviews)


16 in stock


The BKF M4 MOD-0 Stripped Upper Receiver is a step up from our regular BKF-15 stripped uppers. The M4 MOD-0 uppers are held to tighter tolerances, Dry film lubed and tight fitting when paired with our M4 MOD-0 Lowers. Forged from 7075-T6 aluminum, this stripped upper is precision machined to mil-spec M16/M4 specifications and features M4 feedramps. Match this upper with one of our M4 MOD-0 lower receivers for a solid and dependable fit. This upper receiver has laser engraved T-Marks. (The Inside Diameter for the barrel extension is slightly undersized for a tighter fit to the barrel and will produce a more accurate rifle. Please note: you may need to use a heat gun or hair dryer to warm up threaded bore of receiver and freeze your barrel if your barrel extension is too tight.)


  • M4 Feedramps
  • 7075-T6 aluminum
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Dry Film Lubed Upper
  • Type 3 Hard Coat Anodizing
  • Made in the USA
  • Forward assist and dust cover installed

    Additional information

    Weight .75 lbs
    Dimensions 8 × 4 × 4 in

    30 reviews for BKF M4 MOD-0 Assembled Upper Receiver – Black (Light T-Marks)

    1. Christopher M. (verified owner)

      Great upper for the price

    2. Chris Shafer (verified owner)

      Great product

    3. Tom G. (verified owner)

      Nice looking upper, Fit well with my PSA lower….Always nice dealing with B Kings….

    4. Jon (verified owner)

      Quality upper receiver at a great price.

    5. Tony J. (verified owner)

      I started off by ordering little small things from BKings firearms to see how quickly they shipped and the level of service. When I felt comfortable about ordering larger ticket items I was not disappointed. I received my 3x Cerakoted Receiver sets and I am very happy with the product and would not hesitate to let my friends know where they should order these items from.
      thank you


    6. Roderick A. (verified owner)

      Nice quality upper.

    7. david a. (verified owner)

      Perfect. Mates very well with the aero precision gen2 lower.

    8. Nelson (verified owner)

      Great fit and best price around. Very happy with my purchase.

    9. Charles J. (verified owner)

      Exactly as advertised and a great deal…get em’ while you still have the 2A!!! Thanks for a great transaction as well as excellent product!

    10. Norman Flowers (verified owner)

      Very comparable to an aero precision upper

    11. Delton T. (verified owner)

      Perfect and super fast shipping.

    12. Dan B. (verified owner)

      Quality and finish were flawless.

    13. Christopher (verified owner)

      BKing, as always is superb. Always my first choice when shopping for shooting supplies

    14. Derek K. (verified owner)

      Good deal on a great receiver.

    15. Thomas U. (verified owner)

      Excellent fit & finish, outstanding customer support. Called and Blake added this to another order about to ship. Fast shipping.

    16. Thomas U. (verified owner)

      Great value, looks good, excellent fit and finish. Awesome customer service from Blake.

    17. matthew l. (verified owner)

      Just as expected

    18. Paul P. (verified owner)

      Great upper and super clean

    19. jonathan r. (verified owner)

      Good solid upper its a little loose in my spikes tactical lower but locks up tight in both anderson and savage lowers nothing an accuwedge can’t remedy.

    20. James Kerley (verified owner)

      Great fit

    21. Henry (verified owner)

    22. Billy (verified owner)

    23. Chris (verified owner)

    24. Steven (verified owner)

      great price, great looking product

    25. william marzano (verified owner)

    26. Jeffrey (verified owner)

      Upper worked very well. I completed my build and have used it at the range a few times. I’ll be back.

    27. Will Heines (verified owner)

      Barrel fit without any heat, but it is decently snug. Only gave 4 stars because it had a little scratch.

    28. Terry H. (verified owner)

    29. William (verified owner)

    30. Anonymous (verified owner)

      Nice snug fit with a Hanson Ballistic Advantage Barrel

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