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AR15/AR9/AR40 – Lower Parts Kit – LPK – LRPK – Mil-Spec


4 in stock


AR15/AR9/AR40 Lower Parts Kit – LPK – LRPK – Mil-Spec

Everything that you need to turn your stripped AR9/AR40/AR15 Lower into a fully functional unit.

Our LRPK is the perfect way to finish off your build.   All of our parts are Mil-Spec and built to the highest standards.  

31 total pieces
– Selector Semi-Auto
– Selector Detent
– Selector Detent Spring
– Bolt Catch
– Bolt Catch Pin
– Bolt Catch Spring
– Bolt Catch Plunger
– Pistol Grip (A2 Style)
– Pistol Grip Screw
– Pistol Grip Washer
– Takedown Pin
– Takedown Pin Detent
– Takedown Pin Spring
– Pivot Pin
– Pivot Pin Detent
– Pivot Pin Spring
– Magazine Catch
– Magazine Catch Button
– Magazine Catch Spring
– Hammer Assembly – Semi-Auto
– Hammer Pin 
– Hammer Spring
– Trigger – Semi-Auto
– Trigger Pin
– Trigger Spring
– Disconnector – Semi-Auto
– Disconnector Spring
– Buffer Retainer
– Buffer Retainer Spring
– Trigger Guard
– Trigger Guard Pins

Additional information

Weight 0.1417476155 kg
Dimensions 2 × 5 × 5 cm

39 reviews for AR15/AR9/AR40 – Lower Parts Kit – LPK – LRPK – Mil-Spec

  1. D_J

    Got this to round out an A2 build. Everything is top-notch!

  2. Chad J

    Great price and excellent quality.

    For the money this lower parts kit is a excellent value. I have installed these on two milspec lowers and they have operated flawlessly. I would recommend this kit to anyone looking for a milspec lower parts kit

  3. Ken

    Nice quality parts, good fit and function. Great price, thanks much.

  4. T.B.

    I have used several milspec lrpk in the past. This kit is quality and the creep and pull is better than expected for a milspec kit.

  5. Timmy

    I bought 2 kits. The quality is good. I will be ordering more.

  6. Adam in sw Texas

    Best milspec parts kit on the market. I will only use yours for future builds.

  7. Gregory

    Thanks for answering my questions on the phone. The kit arrived yesterday and I installed it today. Works perfect.


  8. a w

    excellent fit

  9. Fiveseven guy

    Overall I believe the product is a very well put together kit. The question is, is it milspec good? The answer is most definitely yes.

  10. Chris

    Works well. Zero problems

  11. Ron

    Great product, everything fit nice

  12. Ron B

    Worked Great – Only negative is USParcel would have only cost $4.54

  13. Andrew K

    Quality kit, Fast Shipping.

  14. Tom L

    Mil-Spec greatness! Seriously good kits.

  15. Jessie R

    This is a quality kit.

  16. Tim M

    Awesome kit quality!

  17. Lonnie B

    Good quality kit. Functions as it should.

  18. David Williamson

    Great product and fast shipping

  19. David


  20. Ted

    Also purchased a 80% lower finished with a 5D parts went in without a problem I finished so quickly I could not believe it.

  21. Chad Morgan

    A complete kit with nothing else needed for my lower build. The trigger has a smooth feel with the pull I needed. Great job!!!!

  22. Tim

    Have not installed yet. The parts arrived in a convenent package, everything is there, and they seem to be of very good quality. Awaiting several more parts prior to assembly

  23. Corey Clayton

    Can’t believe you fit all those parts in that little box. Very impressive. They worked great TY.

  24. Mike

    Good quality LPK and a great price. Will be using more in the future.

  25. Anonymous

    I bought this for an AR9 build. I’m still a ways off from assembly, but all the parts pictured are there and they are good quality.

  26. Anthony

    Great fit, installation a breeze.

  27. Taylor M


  28. Johnathon Brewley

    Exactly what I expected. Everything is there. Works perfect!

  29. Tony

    Great kit, cant wait to get a second one.

  30. Rick D.

    Arrived quickly and good quality parts .

  31. P. Doyle

    arrived quickly always good quality

  32. Nick G.

    All parts were great quality and was delivered quickly.

  33. E.K. Carson

    Well packaged, seems complete. Good to go

  34. Edgardo caraballo

    Everything delivered on time. Good quality for the price. I recommend to everyone.

  35. Ron

    works great in my new lower and is great to have one as a spare set

  36. Ronald Beauchamp

    I am pleased. great price.

  37. Anonymous


  38. Chase goodrich

    This product is a 10/10 I would absolutely recommend it

  39. Anonymous


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