BKF M4 MOD-0 14.5″ 5.56 Govt Profile mid Length 4150 CMV 1/7 Twist Barrel W/ FSB (No Handguard)

(22 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 Dry Film Lubed Assembled Upper Receiver w/ T-Marks
  • BKF AR15 14.5″ 5.56 Govt Profile Mid Length 4150 CMV 1/7 Twist Barrel W/ FSB, Handguard Cap and Delta Ring Assembly
  • Mid Length Gas Tube
  • Product comes assembled
  • No Handguard, BCG or Charging Handle

Standard Upper Features:

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

This BKF 5.56 chambered 14.5 inch Government Profile Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. This barrel includes the front sight base (F-Marked) , handguard cap and delta ring assembly.

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.

Additional Info

Length 14.5″
Material 4150 Chrome Moly Vanadium
Profile Government
Finish QPQ Corrosion Resistant
Gas System Length Mid
Gas Block Journal .750″
Twist Rate 1:7 inches
Muzzle 1/2×28 Threaded
Weight 32oz w/ FSB

B. Kings Firearms barrels are manufactured by a Top Tier Barrel Manufacturer to our specifications. B. Kings Firearms barrels are made for combat and heavy duty use. We rate all of our Pinned Gas Block models for full auto use. We guarantee 1 MOA or better on all BKF barrels when used with match grade ammunition.

Additional information

Weight 2 lbs
Dimensions 20 × 2 × 2 in

22 reviews for BKF M4 MOD-0 14.5″ 5.56 Govt Profile mid Length 4150 CMV 1/7 Twist Barrel W/ FSB (No Handguard)

  1. Steven W. (verified owner)

    GREAT product. Cycles perfect being a midlength gas system. Did a M4 clone build, SBA4 brace, Franklin Binary trigger, MOE handguard, K2 grip, and Primary Arms ACSS 3X32 Prism. Well balanced and 1 MOA at 100 yd using 62gr HP.

  2. Maximo Martinez (verified owner)

    I loved it, and it’s even better than the M4 I had in the Army. HOWEVER, (and this is a non-issue because I replaced the A2 Flash Hider with a ProComp) the A2FH had some serious burrs and machining defects that appeared to threaten making contact with an exiting round from the cutouts around the inside of the A2FH. Other than that, she is good to go. The Melonite finish on the gas tube is a nice touch. Thanks for reasonable pricing, and your customer service!

  3. Anonymous (verified owner)

    Very solid finish on the barrel and bore. She stood up to my torture test; glad I found BKF.

  4. drummer_boy54935 (verified owner)

    Would recommend! Great company, fast shipping, and, quality far exceeds what one would expect for PSA-level prices! Couldn’t pass on this 14.5in barreled midlength upper, the “holy grail,” also ordered an extended A2 flash hider to permanently attach. Mine used the circular handguard end caps, which I wished I’d known sooner, but that’s my fault not their’s. Wanted to use a middy drop in quad rail from MI or Troy, (and still might as I have triangular cap on way) but slapped on some standard middy plastic handguards, and have quite the nice little, lightweight, maneuverable fighting rifle. Will definitely be grabbing a 12.5 upper asap, hopefully before everyone discovers this little gem! 😉

  5. Anonymous (verified owner)

    Bought it for my husband, he is pleased and says Semper Fidelis.

  6. Wes (verified owner)

    Upper is great, great quality at an outstanding price, only downfall I would say is It comes with a round end cap instead of a triangle one

  7. Jordan (verified owner)

    This product did not come w stickers or decals which was a little disappointing. The product I received worked exactly as it should with no malfunctions, it came in a very timely manner, and my grouping has been incredibly tight! I Have and will continue to recommend this company and their product to anybody who asks! Would order from them again in the future! Thanks boys

  8. Robert B. (verified owner)

    The quality of this upper is definitely there, but if you plan to use a drop-in handguard, you’ll have some work to do. Many mid-length drop-ins require the triangular endcap, but this one comes with the circular carbine cap. That means ordering the correct one, and pulling the front sight base to swap them out. Would be a lot less hassle if it came with the correct one.

  9. ageuchi9 (verified owner)

    Excellent work, I added a pin and weld, and they did a fantastic job. Very happy, thank you!

  10. Steven W. (verified owner)

    Outstanding quality & price. 3rd upper from BKF.

  11. Raymond B. (verified owner)

    Always happy with BKings, the product and workmanship is A1!

  12. dawn bates (verified owner)

    (I’m the husband)
    I had a VG6 Epsilon pinned and welded on and am done w/ the build, I found that a Sprinco White and an H2 will cycle low power Wolf .223, I don’t run .223, but wanted to make sure this rifle would do so if needed.

  13. Ryan T. (verified owner)

    Shoots great, perfectly gassed, good build. Love it. Keeping it a simple iron sights gun.

  14. Roberto Salas (verified owner)

    It may take a while to get to you (mine took around 3 weeks) but when you receive it you wont be mad at it. Nice looking upper receiver, Great barrel & everything well built

  15. Anonymous (verified owner)

  16. Orlando Gonzales (verified owner)

    Really great experience over all from ordering to shipping.

  17. Rob G. (verified owner)

    What can I say besides great quality and great price, adding the $30 pin and weld was a no brainer to avoid going the SBR route. 2nd purchase from B Kings with plenty more to come

  18. Robert (verified owner)

    Love this upper. Been to the range with it twice, no problems at all. Smooth shooting with the mid length gas system. Mated up perfectly with my lower, no slop. Pin and weld you did looks good, with extended A2 flash hider.

  19. Steven V. (verified owner)

    Great value!

  20. Dana (verified owner)

    Received as advertised and quickly

  21. Michael S. (verified owner)

    What a great upper I have bought several and will continue to buy more, really fast shipping, thank you B.kings

  22. James F. (verified owner)

    High quality and very affordable

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