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.
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.
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.
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.

Bolt Catch Screw Kit

Calculated at Checkout
Norton Shopping Guarantee

Rest assured, we are shipping all orders in accordance with the ATF rule and due to high demand it is taking us some time.
For concerns on how the rule affects our products view our ATF RULE FAQ page.

Bolt Catch Screw and Allen Wrench Key (hex key)


One of the reasons we chose the DPMS Generation 1 pattern for our AR15, AR9, and AR-308 platform is for the ease in which you can install and change your bolt catch. Gone are the days of having to punch in and out a small roll pin, with the set screw you can swap install or swap a bolt catch in seconds without any worry of scratching your receiver! Purchase this with any lower to make finishing your build a breeze. 
What is a bolt catch?
The bolt catch is what will lock your bolt-carrier group (BCG) to the rear once you run out of ammunition to facilitate reloading. A bolt catch is also useful for clearing malfunctions and showing that the chamber is empty.