| Everything needed to complete your lower, minus the trigger assembly. Proudly Made in the USA. |
Stage 4 AR15 Lower Parts Kit With Phosphate Finish
The Stage 4 Lower Parts Kit provides every lower component needed to finish your AR build, minus the trigger assembly. It is intended for builders who already have a preferred trigger and want to complete the remaining lower receiver hardware with mil-spec parts. Made in the USA, this phosphate kit is a practical option when you plan to source the fire control group separately.
Pair this kit with a separately purchased trigger from our Trigger Parts selection to complete the lower. Before installation, verify the mil-spec components match your specific receiver and that your chosen trigger is compatible with the remaining hardware.
If you would rather not source a trigger separately, the Stage 5 complete kit includes a fire control group. Browse the full range of options in our Lower Kits category to find the configuration that fits your build.
Frequently Asked Questions
The Stage 4 kit provides every lower component needed to finish your AR15 lower receiver except the trigger assembly. It's designed for builders who already have a preferred trigger and want to complete the remaining lower receiver hardware with mil-spec, phosphate-finished parts made in the USA.
No. The Stage 4 kit deliberately leaves out the fire control group so you can source your own trigger. You can add one from our Trigger Parts selection, or choose the Stage 5 complete kit, which includes a fire control group.
Yes. The page describes the kit as mil-spec quality parts intended for correct fitment and function within your receiver. Before installation, verify the components match your specific receiver and that your chosen trigger is compatible with the remaining hardware.
The Stage 4 kit uses a phosphate finish on its components. All parts are made in the USA. If you're comparing finishes across build kits, browse the full range in our Lower Kits category to find the configuration that fits your build.
Orders ship in 2-3 business days, and free shipping is available on qualifying orders. The product is listed as in stock, and White Label Armory offers a 30-day money-back guarantee as noted on the product page.