BKF M4 MOD-0 16″ Govt 5.56 Nato Mid length 1/7 Twist Barrel W/ 17.5″ FFSSR Handguard W/ KAK Flash Can (BKF W/ Pinned Gas Block)

(13 customer reviews)


Out of 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.


  • BKF Dry Film Lubed Assembled Upper Receiver w/ T-Marks
  • Parallax Tactical Slim Profile 17.5″ Slim FFSSR M-LOK Handguard W/ QD Mounts 3 & 9 O’clock on Rear and front
  • BKF AR15 16″ 5.56 Govt Profile Mid Length 4150 CMV 1/7 Twist Barrel W/ Pinned Gas Block
  • .750 Low Profile Gas Block and mid Length Gas Tube
  • KAK Industries Slimline Flash Can
  • 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 17.5″ Slim M-LOK FFSSR

  • Super Slim Profile (1.360″) inside diameter
  • Lightweight design (12oz)
  • 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!!

BKF AR15 16″ 5.56 Govt Profile Mid Length 4150 CMV 1/7 Twist Barrel W/ Pinned Gas Block Features:

This BKF 5.56 chambered 16 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 – 16″

Material – 4150 Chrome Moly Vanadium

Profile – Government

Finish – QPQ Corrosion Resistant

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 4 lbs
Dimensions 28 × 4 × 4 in

13 reviews for BKF M4 MOD-0 16″ Govt 5.56 Nato Mid length 1/7 Twist Barrel W/ 17.5″ FFSSR Handguard W/ KAK Flash Can (BKF W/ Pinned Gas Block)

  1. pcarrero77 (verified owner)

    Excellent quality product really looks good on my rifle. I hope they are available again to buy another one

  2. natezeisloft41 (verified owner)

    This was my first purchase from B. King’s Firearms. I bought this upper and a dozen other pieces for an AR build. I was pleased with every item. These guys sell quality rifles, parts, and accessories. This complete upper was everything I was looking for and than some. The B. King’s barrels are TOP NOTCH! I waited until I had it broke in properly and put enough rounds downrange in different weather and target ideals. It ran flawless! Not only that, but the thing is a tack driver. The rifle shoots far better than I do, which is an awesome thing when you’re no slouch on the trigger. I just need to do my job and the hole corresponds on the target. If you’re on the fence between an item here or at another dealer, I’m telling you I wouldn’t go anywhere else if they have what suits me. Any questions I had concerning my order were answered that same day or promptly the next if they were closed. Can’t beat that.

  3. Kevin (verified owner)

    Sighted in at 50 yards, I was impressed with the exceptional quality. Definitely an amazing completed upper!

  4. Michael Palmer (verified owner)

    The upper is great and functions amazing! And shipped fast!

  5. Kenneth (verified owner)

    Price was very fair and in stock even when your competitors are out! Looks awesome but haven’t had the opportunity to use yet due to COVID and not wanting to go to the range right now. Thanks so much

  6. Jessie Menjivar (verified owner)

    Amazingly fast shipping, arrived before it was estimated, very pleased with how the upper was assembled they even put the charging handle and bolt inside the upper and included the boxes for them in the package

  7. Anonymous (verified owner)

    Fast shipping! Great looking product.

  8. Michael B. (verified owner)

    Fit and finish are great, haven’t had a chance to shoot it yet, but can’t wait!

  9. Anonymous (verified owner)

    Lightning fast processing and shipping. Quality product

  10. Luis S. (verified owner)

    This BKF Upper, Completed my build and got the look I was after! The shipping was fast, free, and tracking was provided, which was super convenient. Great service and there “Email Me” works as expected! Will Purchase again for sure on my next build!

  11. Anonymous (verified owner)

    Handguard lined up perfectly, smooth to the touch for better, centered iron sight alignment. Love the FFSSR style, slim mloc where needed, rails where needed. The KAK looks great partially concealed under the guard and while it doesn’t conceal flash, in a pinch it won’t make you go deaf if you can’t get hearing protection on for a few shots. I need range time with it, but my other BKing upper runs flawlessly and I trust it more than my other platforms. I expect this one to be my “show and tell”.

  12. Christopher Monette (verified owner)

    Couldn’t be happier with it! Thankyou!!!

  13. Anonymous (verified owner)

    Excellent! Exactly as described, perfect fit on mil spec lower. Arrived in just over a week, very fast by today’s standards. Shoots very tight groups, more accurate than i am. Solid and looks great. Will be ordering again!

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