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BKF M4 Mod-1 Lower Parts Kit (LPK) Minus FCG, Trigger Guard and A2 Grip

(33 customer reviews)


89 in stock


This Combat Control Kit is made from billet 4140 heat treated alloy steel with a beautiful nitride finish. The textured surface gives it an enhanced gripping ability. The ambidextrous safety selector can be used as a 90° or 60° throw lever. The mag release is deeply threaded to allow for normal height installation, or thread it halfway to get an extended mag release! The oversized bolt catch makes those mag reloads much easier and quicker. A must have for every build!


  • Takedown Pin – Nitride
  • Pivot Pin – Nitride
  • CAS – Combat Ambi Selector 60/90 – Nitride
  • CMR – Combat Mag Release – Nitride
  • CBC – Combat Bolt Catch – Nitride
  • Mil-Spec Mag Catch Latch – Nitride
  • Mil-Spec spring kit
    • Pivot Pin Spring
    • Takedown Pin Spring
    • Buffer Retainer Spring
    • Selector Spring
    • Bolt Catch Spring
    • Magazine Catch Spring
  • Mil-Spec Small Parts Kit
    • Takedown Pin Detent
    • Pivot Pin Detent
    • Selector Pin
    • Bolt Catch Roll Pin
    • Bolt Catch Plunger
    • Buffer Retainer

This lower parts kit does not include the fire control group, pistol grip or trigger guard.


1x CAS – Combat Ambi Selector 60/90

1x CBC – Combat Bolt Catch

1x CMR – Combat Mag Release



Additional information

Weight .25 lbs
Dimensions 4 × 4 × 1 in

33 reviews for BKF M4 Mod-1 Lower Parts Kit (LPK) Minus FCG, Trigger Guard and A2 Grip

  1. Matthew P. (verified owner)

    The quality of the parts are outstanding and it adds a flare that a regular lpk doesn’t.

  2. Anonymous (verified owner)

    So far so good

  3. Alexander M. (verified owner)

    Was missing bolt catch spring

  4. Michael B. (verified owner)

    Great quality product, shipped fast

  5. Tyler H. (verified owner)

  6. Kevin (verified owner)

    There was a minor mix up with individual parts from this kit but when I reached out BKF was immediately on top of it! I am happy to see great service is still around and will happily continue to do business with BKF.

  7. Harrison (verified owner)

    Will continue to shop your products

  8. James Rutledge (verified owner)

    Thank you guys, my past two experience with BKF have been phenomenal. Thank you for all you do and stay safe.

  9. Anonymous (verified owner)

  10. Anonymous (verified owner)

  11. Britton S. (verified owner)

    Where have these been all my builds!? These are now my secret sauce Im digging the dimples and ambi selector. It just feels so right, has a nice click and solid engagement it’s not a wobbly wonky one like some milspec ones, the kit fit like a glove and looks quality. It’s not FCD but don’t let that turn you away it’s good.

  12. Nathan M. (verified owner)

    Excellent quality LPK, great price. The finish is very well done, the ambi safety is my favorite so far.

  13. Anonymous (verified owner)

    It’s an ok product the ambi safety has a little bit sharper edge than I’m accustom to.

  14. Miles Downing (verified owner)

    Handy lower parts kit. Price is much lower than you expect for parts like this.

  15. Michael J. (verified owner)

  16. Anonymous (verified owner)

  17. Anonymous (verified owner)

    very likely the best value for properly upgraded LPK available on today’s market. Great machining and I do believe the metal itself is higher quality than some LPK I’ve tried. If BKing has the right part for you, buy it!

  18. CHRISTOPHER STEVENS (verified owner)

  19. Anonymous (verified owner)

    Easy to install. Nice finish on the materials used.

  20. Anonymous (verified owner)

  21. Anonymous (verified owner)

  22. John (verified owner)

    Amazing Quality As Always! Purchase With Confidence!

  23. Aaron Stroman (verified owner)

    A but pricey for what you get, but it does the job.

  24. Randy (verified owner)

  25. Michael Casertano (verified owner)

    I’ve put a few lowers together and this kit is definitely a step up.

  26. Anonymous (verified owner)

  27. Kent A. (verified owner)

    Best price on lower parts kit out there. Quality too.

  28. Anonymous (verified owner)

    Good quality for the price.

  29. Gaylon B. (verified owner)

  30. Jake (verified owner)

    Safety isn’t bad, but would be better if the levers were steel instead of aluminum. Also if texture was added to the sides of the levers where the thumb engages. The rest of the parts are excellent, especially the bolt catch!

  31. Jason Johnson (verified owner)

  32. Chris Clark (verified owner)

    Good quality product will definitely be buying more for all my future builds

  33. Andrew W. (verified owner)

    I love this part’s kit! This will primarily be a hunting rifle and the enhanced parts are just enough to operate with gloves on I strongly recommend!

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