BUILD AT HOME
80% Arms sells AR-15 and .308 80% Lower Receivers, 80% Lower Jigs and other accessories which allow you to legally build a firearm at home in most states.
INCREDIBLY PRECISE
We utilize state of the art 5-axis CNC machines to mill all our .308 and AR-15 80 percent lower receivers to incredibly precise tolerances using premium billet aluminum.
RIDICULOUSLY EASY
We also offer our patented AR-15 and .308 Easy Jigs® which is the first 80% lower jig that makes it ridiculously easy for a non-machinist to finish their 80% lower in under 1 hour with no drill press required.
100% SATISFACTION GUARANTEED
Products manufactured by 80% Arms carry a lifetime warranty against manufacturing defects. We will promptly replace or repair any product that we determine to be defective.
AR 15 Build Kits
WHAT IS AN AR-15 BUILD KIT?
The AR-15 rifle build kit includes absolutely everything that you need for completing an AR-15 style rifle. Choose your rifle length, desired caliber (5.56/300BLK), and customize to your heart’s content! This takes all the parts hunting out of building a new rifle from an 80% lower. This way you get an entire AR-15 build shipped to your door, and all that is left for you to do is mill out and assemble the lower receiver.
Can't figure out which caliber you want to go with? Check out our blog on 5.56 vs 300 Blackout?
WHY CHOOSE AN AR-15 BUILD KIT?
For those not comfortable installing all the AR-15 components together themselves, our in-house Armorer will do it for you!
With 80 Percent Arms build kits we guarantee these parts’ compatibility with each other and you get to fully customize your AR-15 rifle build, interchangeably selecting high quality parts with just a click of a button. Instead of hunting down these parts separately, save your time and money by designing a complete rifle at our one-stop shop.