BKF AR15 10.5″ 5.56 Nato Govt 1/7 Twist 4150 Steel Barrel W/ 11.5″ FFSSR M-LOK Rail W/ KAK Flash Can

(3 customer reviews)


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SKU: BKING-10.5-556-11.5-BCA Categories: , ,


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 11.5″ Slim FFSSR M-LOK Handguard W/ QD Mounts 3 & 9 O’clock on Rear and front
  • BCA 10.5″ Parkerized 4150 steel Govt barrel in 556 Nato W/ Carbine Length Gas system and 1:7 TWIST
  • KAK Industries Slim 1/2×28 Flash Can
  • .750 Low Profile Gas Block and Carbine 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 11.5″ Slim M-LOK FFSSR

  • Super Slim Profile (1.360″) inside diameter
  • Lightweight design (9oz)
  • Free Floated
  • QD Swivel mounting holes at the 3 and 9 oclock positions at front and rear
  • Picatinny rails at the 3, 6 and 9 oclock positions
  • M-LOK Compatible
  • Made in the USA!!


Additional Info

Caliber – 556 Nato

Barrel Length – 10.5″

Barrel Material – 4150 Chrome Moly Vanadium

Profile – Govt

Finish – Parkerized

Gas System Length – Carbine

Gas Block Journal – .750″

Gas Hole Diameter – 0.093

Twist Rate – 1:7 inches

Muzzle – 1/2×28 Threaded

Total Weight of Upper Reciever without BCG – 2lb 15oz

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

3 reviews for BKF AR15 10.5″ 5.56 Nato Govt 1/7 Twist 4150 Steel Barrel W/ 11.5″ FFSSR M-LOK Rail W/ KAK Flash Can

  1. Chris L. (verified owner)

    Good quality. Would recommend to friends.

  2. Huey N. (verified owner)

    lightweight and compact

  3. MYLES KEHR (verified owner)

    This complete upper was everything I was hoping it would be. The upper receiver has a better finish on it than my lower that I paid over $120 for. The low profile rail is absolutely awesome, feels very strong and solid. The whole package is just a great value overall. BFK has become my go-to site for all my AR parts now. I can’t recommend this thing enough. I’ll definitely be purchasing more of these upper assemblies for future projects.

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