Skip to main content
cc-settings-icon 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.
cc-gun-icon 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.
cc-hand-icon 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.
cc-thumbs-icon 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.

80% BLOGS

AR15 Gas Tube Guide

AR15 Gas Tube Guide

80 Percent Arms | Nov 22nd 2022

AR 15 gas tube lengths can be - as most anything else on the AR15 platform, totally customized to whatever the shooter prefers or needs. So which AR 15 gas tube should we choose as shooters? What...
Read More read more button read more button
Which handguard for AR15?

Which handguard for AR15?

80 Percent Arms | May 18th 2022

Ready to build your AR-15 from an  80% Lower? Collecting the parts required can seem like a daunting task! This time let’s focus on the AR handguard as there are so many available options!...
Read More read more button read more button
AR-15 Rail Systems Comparison

AR-15 Rail Systems Comparison

80 Percent Arms | Apr 27th 2022

Choosing a handguard or rail system for your AR-15 can be a daunting task with so many great options available on the market currently. Choosing the right rail system is a very important decision...
Read More read more button read more button
Muzzle brake vs Compensator vs Flash Hider

Muzzle brake vs Compensator vs Flash Hider

80 Percent Arms | Mar 30th 2022

*Update: This blog has been updated to reflect more accurate information in 2022. One of the most common mistakes made in the gun community is referring to a magazine as a ‘clip’ , but a very close...
Read More read more button read more button