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.
YOUR RECENTLY VIEWED ITEMS
GST-9 Frame Spare Pins
$7.99
or 4 payments of with 
Did you lose your GST-9 pins while working on a new build? Not to worry we have not only got some spare parts for you, but an UPGRADE.
The 80% Arms GST-9 Replacement Pins include 4 steel pins which can cover the ones that you may have lost from your initial frame/jig purchase. Your new steel pins will help increase tolerances, reduce pin walking and overall stability of your GST-9 frame.
Two pins are for the grip module. One pin is for the B2 hole which is the frontward hole of the front rail. The last pin is for the B1 hole which is for the rear rails.
*Please note that this does not come with the trigger pin which goes into hole 'A' in the rear of the front rail section.
For more details see the GST-9 MOD1 instructional guide.
