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BKF M4 MOD-0 18″ 6.5 Grendel Rifle Length Nitrided 416-R SPR Barrel W/ 15.25″ M-LOK Handguard


31 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. All Complete uppers are headspaced prior to shipping and test fired.


  • BKF M4 MOD-0 Dry Film Lube Assembled Upper Receiver w/ T-Marks
  • BKF M4 MOD-0 15.25″ M-LOK Handguard
  • BKF AR15 18″ 6.5 Grendel Rifle Length Nitrided 416-R SPR Barrel Type II 1/8 Twist
  • BKF Mil Spec Low Profile Gas Block and Stainless Steel Rifle Length Nitride Gas Tube
  • BKF M4 MK2 .30 Comp
  • Product comes assembled
  • No BCG or Charging Handle

BKF M4 MOD-0 Assembled Upper Features:

  • M4 Feedramps
  • 7075-T6 aluminum
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Thermal Fit Dry Film Lubed Upper W/ Oversized Lugs for tight fitment with most receivers
  • Type 3 Hard Coat Anodizing
  • Made in the USA
  • Forward assist and dust cover installed

BKF M4 MOD-0 15.25″ M-LOK Handguard

The all new BKF AR15 MOD-0 rail featuring M-LOK is now available from BKF. This new handguard model utilizes top quality machining and finishes along improved ergonomics for AR-15 platform firearms.

  • Made in U.S.A.
  • M-LOK mounting solution
  • Mil-Spec hardcoat black anodized (Type III, Class 2)
  • Free floating design
  • QD mounts on rear 3 and 9 o’clock positions
  • QD mounts on front 3, 6 and 9 o’clock positions
  • 15.25” Rail with nut and hardware

BKF AR15 18″ 6.5 Grendel Rifle Length Nitrided 416-R SPR Barrel Features:

This 6.5 Grendel chambered 18 inch barrel is machined from 416 Stainless Steel with a QPQ corrosion resistant finish. This BKF 416-R Barrel features a FailZero Nickel Boron Coated Extended M4 Feed Ramp Extension.

Additional Info

Length – 18″

Material – 416R Stainless Steel

Profile – SPR

Finish – QPQ Nitride

Gas System Length – Rifle

Gas Block Journal – .750″

Twist Rate – 1:8 inches

Muzzle – 5/8″x24 Threaded

Weight – 40oz

Other Info – HP and MPI Tested

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.

PRODUCT SKU: BKF-M4M0-18-6.5-15.25

Additional information

Weight 4 lbs
Dimensions 28 × 4 × 4 in


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