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BKF AR15 18″ 6.5 Grendel SPR 1/8 Twist Rifle Length Barrel W/ 15″ Slim M-LOK Rail

(1 customer review)


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 Assembled Upper Receiver w/ T-Marks
  • BKF Slim Profile 15″ Slim M-LOK Handguard
  • BKF AR15 18″ 6.5 Grendel 1/8 Twist Rifle Length Nitrided 416-R SPR Barrel
  • BKF HD .750 Low Profile Gas Block and Rifle Length Gas Tube
  • BKF A2 Flash Hider
  • Product comes assembled
  • No BCG or Charging Handle

Standard Upper Features:

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

Handguard Description:

Machined from a 6061-T6 extrusion, BKF standard line of free float handguards will provide you with a lifetime of service. The 6061-T6 aluminum barrel nut does not need to be indexed for gas tube clearance. The anti-rotation tabs are designed to fit a standard forged upper receiver and will ensure that the rail will not shift if the mounting screws come loose. The patented ASAL mounting feature ensures that there is no forward movement of the handguard and keeps it from shifting due to tension on the mounting screws. Anti-rotation tabs may be a tight fit on forged uppers, and may require hand fitting on billet uppers.

  • 6061-T6 Aluminum, Hard Coat Anodized
  • Includes 6061-T6 Aluminum Barrel Nut, Hard Coat Anodized
  • Top Rail Length: 15″
  • Inside Diameter: 1.350″
  • Weight with Mounting Hardware: 12.6 ounces
  • M-LOK® Mounting Points at 3:00, 6:00 and 9:00
  • Requires a 1-3/16″ Open-end Wrench for Barrel Nut Installation (not included)
  • Compatible with Low Profile Gas Blocks
  • 100% American Made

Additional Info

This 6.5 Grendel Type II 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.

This barrel features a longer .750” profile dimension necessary for proper installation of the OPS Inc 12th model collar and suppressor.

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 Threads – 5/8×24

Weight – 41oz

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.


Additional information

Weight 3 lbs
Dimensions 28 × 4 × 4 in

1 review for BKF AR15 18″ 6.5 Grendel SPR 1/8 Twist Rifle Length Barrel W/ 15″ Slim M-LOK Rail

  1. Anonymous (verified owner)

    Great upper have two of them

  2. steven f. (verified owner)

    My new favorite company the prices are great and after inspecting the product I felt like I got more than my money was worth

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