AR-15 Lower Parts Kit

Our AR-15 Lower Parts Kit is a military-spec lower parts kit that includes all components necessary to finish building your AR15 lower receiver. Whether your building a new rifle or just want to stock a spare parts kit, this kit is ideal for both uses. Order today and build your next AR!

In stock

Color Black
  • Buy 3 for $39.95 each and save 20%


  • Mil-Spec Fire Control Group (Trigger, Hammer, Disconnector)
  • 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 Magazine Catch
  • 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 Buffer
    • Buffer Retainer
  • Mil-Spec Grip Kit
    • A2 Grip
    • Hex-head screw
    • Lock washer
  • Mil-Spec Aluminum Trigger Guard Kit
    • Trigger Guard
    • Trigger Guard Roll Pin

More Information

Brand United Defense LLC
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Customer Reviews

Works great easy to install
Review by Asantae H.
Verified Buyer
Works great easy to install
$20 cheaper than the local
Review by Kuba S.
Verified Buyer
$20 cheaper than the local shops!
Great LPK
Review by Plutarco T.
Verified Buyer
The trigger is great and I really like the push pins.
Always great full and fast
Review by Quintrel W.
Verified Buyer
Always great full and fast service
Excellent Quality!!
Review by Abimbola Q.
Verified Buyer
You will not be disappointed with this lower parts kit. Excellent quality as expected.
A must have
Review by Nazmir G.
Verified Buyer
Buy this and throw it in the ol' tackle box. You might need it sometime
Great store to buy from!
Review by Zayvian Q.
Verified Buyer
Building an AR with my son. Good quality parts that are very aesthetically pleasing. Fast shipping with very competitive prices. I would recommend to anyone looking for parts.
Very nice kit! Fit perfect and trigger is awesome!
Review by Seigo C.
Verified Buyer
Use it on daily basis, never had any issues. Love it! Thank you very much!
Great LPK
Review by Aljaquan J.
Verified Buyer
Had fun building first AR with this kit. Was super smooth and results are great.
Worked great, great communication and quick delivery
Review by Sahan B.
Verified Buyer
Great product at a great price
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