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BKF AR15 Lower Build Kit

(26 customer reviews)


74 in stock


This product is 100% made in the USA! All components are phosphate  coated and include quality Mil-Spec parts for completing your AR15 lower receiver. Pair with our buffer tube assemblies for a smooth hassle free build.

  • A smoother pull with reduced grittiness

  • An enhanced basis for performing a trigger job


  • Fire Control Group (Trigger, Hammer, Disconnector)
  • Magazine release Button
  • Mil-Spec spring kit
    • Hammer Spring
    • Trigger Spring
    • Disconnector Spring
    • Pivot Pin Spring
    • Takedown Pin Spring
    • Buffer Retainer Spring
    • Selector Spring
    • Bolt Catch Spring
    • Magazine Catch Spring
  • Mil-Spec Selector
  • Mil-Spec Bolt Catch
  • Mil-Spec Mag Catch Latch
  • Mil-Spec Small Parts Kit
    • Takedown Pin
    • Takedown Pin Detent
    • Pivot Pin
    • Pivot Pin Detent
    • Trigger Pin
    • Hammer Pin
    • Selector Pin
    • Bolt Catch Roll Pin
    • Bolt Catch Plunger
    • Buffer Retainer
  • Mil-Spec Grip Kit
    • A2 Grip
    • Hex-head screw
    • Lock washer
  • Mil-Spec Metal Trigger Guard Kit
    • Trigger Guard
    • Trigger Guard Roll Pin

BKF Mil-Spec AR15 or LR308 (DPMS) Anti-Rotation Carbine Length Buffer Tube:


  • BKF T6 6061 Mil-Spec buffer tube (6 Position) – U-cut Anti-Rotation
  • BKF 3 oz carbine buffer
  • BKF Carbine buffer spring
  • BKF Steel end plate
  • BKF Steel castle nut
  • M4 Sliding stock

Additional information

Weight 1 lbs
Dimensions 8 × 4 × 4 in

26 reviews for BKF AR15 Lower Build Kit

  1. Blake (verified owner)

    good quality milspec kit

  2. Leo (verified owner)

    Great LKP with a few other things. No complaints highly recommended

  3. Justin (verified owner)

  4. Denzil Hardway (verified owner)

    Great price fast shipping. Highly recommend

  5. James Johnson (verified owner)


  6. Todd Hoyer (verified owner)

    Shipping was crazy fast and the kits seem great!

  7. Seth (verified owner)

  8. BEN S. (verified owner)

    My order arrived in a timely manner, good quality, fair price. Very satisfied.

  9. John Sennett (verified owner)

  10. Anonymous (verified owner)

    Basic kit went together without issue. B King is my go to for all parts. Quick ship and priced right.

  11. Roy Keen (verified owner)

    I love the parts kits and the fast service to ship but I’m disappointed in the using the usps for shipping,my parts shipped Monday and still in ohio,FedEx or ups is much better than usps priority mail because I’ve stopped using other companies for the slow shipping by the postal service.

  12. Timothy M. (verified owner)

    Items arrived quickly and as described online.

  13. Michael (verified owner)

    Fast delivery, very happy!!

  14. Jonathan D. (verified owner)

    Solid parts kit, smooth installation. Only catche was that the kit I received was missing the pistol grip bolt and trigger guard. Quick email to the company and they immediately sent me the required parts. Overall great customer service.

  15. Russell C. (verified owner)

    Love you guys, I buy a lot from you and I’ve never had any issue, but this last one you shorted me a trigger guard, roll pin, and grip screw.

  16. Lynwood S. (verified owner)

  17. Charles Bell (verified owner)

    Good company good prices

  18. Raul E. Macias (verified owner)

    very slow shipping

    • blake king (store manager)

      We delivered it to your door in 5 days…that’s including a weekend

  19. James (verified owner)

    Great product came as described. Shipping was very fast. I would definitely recommend and do business again.

  20. Thor (verified owner)

    Awesome products awesome company

  21. ALFRED (verified owner)

  22. jaime c. (verified owner)

  23. Jessica J. (verified owner)

    Great kit, quick delivery. Thank you !

  24. James M. (verified owner)

  25. Dean K. (verified owner)

    Parts all fit in perfectly and everything was there. One of the roll-pins had snuck out of one of the smaller baggies but stayed with everything else.

    For a low-budget build this is fantastic! The stock looks and feels cheap but it functions fine and can always be upgraded later. Great buy.

  26. Jon Merritt (verified owner)


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