| 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.