Lightweight Polymer LPK

New Frontier Armory

(5 reviews) Write a Review
0.25 LBS
Lightweight Polymer LPK
BBL Length:
Magnification Range:
Tube Size:

Polymer Lower Parts Kit (LPK)

  • Manufacturer:New Frontier Armory
  • 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 proudlyMADE IN THE USAby hard working American men and women.

Weight: 0.25 LBS
Dimensions: 4.00 x 4.00 x 1.50 in
Size: N/A
Color: N/A

5 Reviews Hide Reviews Show Reviews

  • 5
    LW -4 stripped lower

    Posted by Chris carbine on 12th Oct 2023

    Built nice ? I did some Mexican injunity, elbow greese to make the trigger pins set, although I had little parts flying everywhere but found everything except a small internal take down pin lost in oblivion somewhere ,its ok that's what oops kits are for ? I like the trigger pull? my first lower I put together, there is a first time for everything ? thank you NFA

  • 5
    Perfect for my .22LR

    Posted by Anthony Vine on 24th Aug 2023

    Ordered this set for my new .22LR..and I am impresed. I put the set into my FMK Polymer lower, and it has done as well as a standard Mil-Spec LPK...will be looking to purchase another very soon

  • 5

    Posted by Ronald Killips on 10th Jun 2017

    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?

  • 5

    Posted by on 6th Mar 2017

    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.

  • 4

    Posted by on 17th Jul 2014

    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.

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