Anderson Manufacturing AR-15 Lower Parts Kit - Stainless Hammer and Trigger

Manufactured by Anderson Manufacturing
MPN: G2-K421-A000-0P
Manufactured by Anderson Manufacturing
95 Reviews

In Stock

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The Anderson Manufacturing AR-15 Lower Parts Kit is a top-of-the-line kit designed for those who demand the best in their firearms. This kit includes all the necessary parts to complete your AR-15 lower receiver, including a stainless steel hammer and trigger. The stainless steel construction ensures durability and longevity, making this kit a reliable choice for any shooter. The kit includes a pistol grip, trigger guard, magazine catch assembly, bolt catch assembly, buffer tube assembly, and all necessary pins and springs. Each part is precision-machined to ensure a perfect fit and reliable performance. The kit is compatible with all mil-spec AR-15 lower receivers and is easy to install with basic tools.


  • Includes all necessary parts to complete AR-15 lower receiver
  • Stainless steel hammer and trigger for smooth and crisp trigger pull
  • Precision-machined parts for perfect fit and reliable performance
  • Compatible with all mil-spec AR-15 lower receivers
  • Ergonomic pistol grip for improved accuracy and comfort


  • 1x stainless steel hammer, 1x hammer spring, 1x stainless steel trigger, 1x trigger spring, 2x hammer/trigger pins, 1x disconnector, 1x disconnector spring
  • 1x bolt catch, 1x bolt catch plunger, 1x bolt catch roll pin, 1x bolt catch spring
  • 1x buffer retainer, 1x buffer spring
  • 1x magazine catch, 1x magazine catch button, 1x magazine catch spring
  • 1x A2 pistol grip, 1x pistol grip screw, 1x pistol grip lock washer
  • 1x standard safety selector, 1x safety selector detent spring, 1x safety selector detent
  • 1x takedown pin, 1x pivot pin, 2x takedown/pivot pin detents, 2x takedown/pivot pin springs
  • 1x trigger guard, 1x trigger guard roll pin

The Anderson Manufacturing AR-15 Lower Parts Kit is a high-quality and reliable choice for anyone looking to build or upgrade their AR-15. With its precision-machined parts and stainless steel construction, this kit is built to last and provide reliable performance.

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BrandAnderson Manufacturing
ManufacturerAnderson Manufacturing
Weight8 Oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

First time AR build


Added this LPK to the budget Anderson stripped lower. Everything fit as expected. I just followed a YouTube how to video. Bought a DT stock kit as well. Now I just need an upper and I'm in business! Primary Arms is great. I just wish they were open a few hours on Saturday for the working man.

Everything l buy @ Primary Arms


As l expected, on time and exactly what I ordered. I've been doing business with them for two years now and they are a 5 star company.

Good fit, good finish


As with everything I have ordered from Primary, top quality and fast shipping.

Parts kit


Awesome service and shipping. Although i don't need it, I would have thought a parts list and instructions would have been included. No biggy.

good product at great price


best bet for basic builds.

Great Price, great service


Bought this and as always, have never been disappointed by any purchases made from primary arms. I recommend PA to all my friends

Great Parts


Came fast, fit well. Everything seems to work fine.

Lower parts kit


Everything is there and the workmanship looks to be very good.

TC Group


Exceptional quality at a value price. Would buy again!

Anderson lower parts kit


Fast shipper and received product as ordered. Will be doing buisness in the future.Thank You.