BKF AR15 7.5″ 300 Blackout 1/7 Twist 4150 Steel Barrel W/ 7.25″ Slim M-LOK Rail W/ KAK Micro Flash Can

(9 customer reviews)

$254.99 $174.99

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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 Assembled Upper Receiver w/ T-Marks
  • Parallax Tactical Slim Profile 7.25″ Slim M-LOK Handguard W/ DQ mounts at 3 and 9 O’clock at the rear
  • BCA 7.5″ Heavy 4150 steel contour Govt barrel in 300 Blackout W/ Pistol Length Gas system and 1:7 TWIST
  • KAK Micro flash Can
  • .750 Low Profile Gas Block and Pistol Length Gas Tube
  • Product comes assembled
  • No BCG or Charging Handle

Standard Upper Features:


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

 Parallax Tactical 7.25″ Slim Hybrid M-LOK

The Super Slim Hybrid M-LOK by Parallax Tactical is a free floating, extremely durable, drop in rail for your rifle.  Utilizing the brand new Magpul M-LOK standard with strict adherence to Magpul’s technical specifications, this rail system is guaranteed to work with officially licensed M-LOK acessories.

The Lightweight FFSSR Hybrid series rail is a Hybrid of the minimalist rail, having removed the QD cups and extra bulk from the front versions of the FFSSR.

The FFSSR Hybrid is made to be durable, simple, and extremely easy to machine.  This durable free floating rail is one of the most affordable on the market as a result.

  • Made from Aluminum
  • Finished in Type III HardCoat Anodizing
  • Steel Barrel Nut finished in Black Nitride for corrosion resistance
  • Grade 8 Fasteners
  • 1.30″ internal diameter
  • 1.60″ outside diameter
  • M-LOK slots at the 3, 6, and 9 o’clock sides
  • QD at Rear 3 and 9 o’clock positions
  • 6oz

Additional Info

Caliber – 300 Blackout

Barrel Length – 7.5″

Barrel Material – 4150 Chrome Moly Vanadium

Profile – Heavy

Finish – Parkerized

Gas System Length – Pistol

Gas Block Journal – .750″

Gas Hole Diameter – .109

Muzzle – 5/8×24 Threaded

Twist Rate – 1:7 inches

Total Weight of Upper Receiver without BCG – 2lb 5oz

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 information

Weight 3 lbs
Dimensions 20 × 4 × 4 in

9 reviews for BKF AR15 7.5″ 300 Blackout 1/7 Twist 4150 Steel Barrel W/ 7.25″ Slim M-LOK Rail W/ KAK Micro Flash Can

  1. Glenn Calvin (verified owner)

    Quick shipment on an appropriately priced piece of excellent equipment.

  2. Mike C. (verified owner)

    First order through you guys, everything was as expected, good price too.

  3. Anonymous (verified owner)

    Fastest shipping in the biz!!

  4. Anonymous (verified owner)

    Fast shipping. Looks like it should. Haven’t shot yet, but everything seems good quality.

  5. Walter T. (verified owner)

    Awesome value and quality parts. B. King’s Firearms is a pleasure to deal with and their service is a cut above the rest!

  6. Paul B. (verified owner)

    Great product at a great price!

  7. Anonymous (verified owner)

    Great upper, definitely great quality!! Looking forward to future business

  8. Nick (verified owner)

    Great quality & prices! And shipping was fast! Will definitely be giving BKings my business again, thanks!

  9. Derek Harris (verified owner)

    A+++++Transaction!! Great service and price. Highly recommend.

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