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BKF M4 MOD-0 14.5″ 5.56 Nato Mid Length Nitrided Barrel W/ 13″ M-LOK Handguard (BKF W/ Pinned Gas Block)

(2 customer reviews)


15 in 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. The BKF AR15 M4 MOD-1 Rail M-LOK series provides an alternative aesthetically progressive design that is lightweight with our 7075-T6 Aluminum barrel nut and attach method. The innovative attachment of the rail and the barrel nut provides a solid lockup, a seamless, strong joint that requires no timed alignment to the barrel nut itself. All BKF M4 MOD-1 rails (and receivers for that matter) are designed with pocketed cutouts to further minimize weight. In addition, BKF M4 MOD-1 rails offer QD mounting at the rear 3,6 and 9 O’clock of the handguard.


  • BKF M4 MOD-0 Assembled Upper Receiver w/ T-Marks
  • BKF AR15 MOD-1 13″ M-LOK Handguard
  • BKF AR15 14.5″ 5.56 Nato Mid Length Nitrided 4150 CMV Barrel W/ Pinned Gas Block
  • .750 Low Profile Gas Block and Mid Length Gas Tube
  • Product comes assembled
  • No BCG or Charging Handle
  • Complete Upper weight – 2lb 14oz

BKF M4 MOD-0 Assembled Upper Features:

  • 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
BKF AR15 M4 MOD-1 13″ M-LOK Rail Features:
  • Made from U.S.A. sourced 6061 Extrusion
  • U.S.A. sourced 7075-T6 Aluminum barrel nut as standard
  • M-LOK mounting solution
  • Mil-Spec hardcoat black anodized (Type III, Class 2)
  • Free floating design
  • QD mounts on rear 3,6 and 9 o’clock positions
  • 1.3” Internal Diameter
  • 13” Rail with Aluminum nut and hardware (weight 9oz)

BKF AR15 14.5″ 5.56 Govt Profile Mid Length 4150 CMV 1/7 Twist Barrel W/ Pinned Gas Block Features:

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 a QPQ .750 Low-Pro gas block drilled for a 1/8″ pin which is included. This pinning insures that your gas block never comes loose once installed.

Additional Info

Length – 14.5″

Material – 4150 Chrome Moly Vanadium

Finish – QPQ Nitride

Profile – Govt

Gas System Length – Mid

Gas Block Journal – .750″

Twist Rate – 1:7 inches

Muzzle – 1/2×28 Threaded

Weight – 27oz

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 3 lbs
Dimensions 28 × 4 × 4 in

2 reviews for BKF M4 MOD-0 14.5″ 5.56 Nato Mid Length Nitrided Barrel W/ 13″ M-LOK Handguard (BKF W/ Pinned Gas Block)

  1. Raymond McPeek (verified owner)

    Awesome experience the order was shipped out promptly and I recieved it quickly. I work at a Gun shop and have sent people over to the site. Great job guys keep up the good work.

  2. Brian Decker (verified owner)

    Fast shipping! On arrival it seems the wrong handguard was installed. Team took it back, replaced with the correct handguard, and returned it right to me no hassles.

    Shot it today and love the feel on it. Definitely recommend B.Kings!

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