Lightweight Polymer LPK

(3 customer reviews)


  • Manufacturer: New Frontier Armory
  • Model: Polymer Lower Parts Kit (LPK)
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SKU: LPK-LW Category:


  • Manufacturer: New Frontier Armory
  • Model: Polymer Lower Parts Kit (LPK)
  • Compatible With: All Standard Mil Spec AR-15 Lower Receivers AND LW-15 Polymer Lower Receivers

The New Frontier Armory Polymer Lower Parts Kit (LPK) has everything you need to complete your stripped AR-15 Lower Receiver except a stock kit and trigger guard.

Included in this kit is the following polymer parts (unless noted otherwise):

  • Magazine Catch Spring (metal)
  • Selector Spring (metal)
  • Takedown Pin Detent Spring (metal)
  • Pivot Pin Detent Spring (metal)
  • Buffer Retainer Spring (metal)
  • Bolt Catch Spring (metal)
  • Disconnector Spring (metal)
  • Trigger Spring (metal)
  • Hammer Spring (metal)
  • Trigger Pin (metal)
  • Hammer Pin (metal)
  • Bolt Catch Roll Pin (metal)
  • Bolt Catch Detent
  • Selector Detent
  • Takedown Pin Detent
  • Pivot Pin Detent
  • Pistol Grip
  • Pistol Grip Screw (metal)
  • Pistol Grip Lock Washer (metal)
  • Pivot Pin
  • Takedown Pin
  • Buffer Retainer (metal)
  • Bolt Catch (metal)
  • Magazine Catch
  • Magazine Catch Button
  • Trigger
  • Hammer
  • Disconnector
  • Selector

These kits are perfect for building out your stripped polymer lower receiver or for a lightweight build you’re working on with any standard AR-15 lower receiver.

**NOTE: These kits contain the same parts we use at the factory for our LW-15 Complete Polymer Lower Receiver and DO NOT contain a trigger guard.



Q: Why is the safety selector able to turn to safe regardless of hammer position

A: This is an added safety feature that allows the firearm to be put on “Safe” whether the hammer is cocked or forward.  We believe this is a much safer solution to ensure the safety of our users and will not affect normal use in any other way.



The New Frontier Armory Polymer Lower Parts Kit (LPK) is proudly MADE IN THE USA by hard working American men and women.

Additional information

Weight .25 lbs
Dimensions 4 × 4 × 1.5 in

3 reviews for Lightweight Polymer LPK

  1. [email protected]

    Worked as advertised and described. All the parts fitted without a problem. I did have a problem with the selector detent but it was replaced quickly by NFA and solved the issue. I was able to lose a couple .oz off a lightwieght build. The LPK has held up to 800+rds of abuse. I will order from New Frontier Armory again.

  2. [email protected] (verified owner)

    Just what I wanted, everything was just excellent. Fit, finish and quality is far above average. Helped me build the ultimate lightweight rifle! Thanks New Frontier Armory.

  3. Ronald Killips (verified owner)

    Precise fit. Unimaginable that poly can be made into such critical parts. Molding and fit were perfect with the exception of very minor adjustment with a needle file. What’s next
    , could new frontier armory come out with a tough poly carbine buffer tube so I can shave even more weight or maybe a poly delta ring?

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