To install the jig
on your 80% lower, install the side plates of the jig first on your lower. Leave the side plates a little loose and
install the top plate you are going use, i.e. drill plate, mill plate. Tighten the top plate and then side plates.
I like to drill the
trigger pin and safety holes on the 80 percent lower receiver after I finish
drilling or milling the magazine well and safety pocket. This leaves very
little material to drill though to deflect the drill bit off center.
For 80 percent lower receivers
that are not anodized, one product that you can use is Brownells Aluma-Hyde II
for your finish. We found this product to be surprisingly tough and easy to
use. The only drawback is the curing time, 14 days. Brownells website has
instruction videos on using Aluma-Hyde and other like Cerakote.
I am frequently asked if
you can actually finish an 80 percent lower receiver with a drill press. Yes
you can, but be aware, however, this method is extremely labor intensive. After
you are finished drilling out the magazine, safety and rear takedown pin
cavity, you must use a file to finish the AR15 80 percent lower which is
labor-intensive. The mill plates can be used as guides for your hand forming
(filing) of 80percent lower receiver cavities.If
you have a Drill Press with a sturdy spindle, you can use an End Mill bit to
finish your lower. You will need a
Drill Press Milling Vice which you can get at Harbor Freight, http://www.harborfreight.com/5-in-rugged-cast-iron-drill-press-milling-vise-69159.html. You
can also get an End Mill at http://www.use-enco.com/CGI/INSRHM, 3/8” is the most popular. I would use the drill bits to remove
most of the material then finish with the end mill.
You Must Legally be allowed
to possess a firearm.
If you live in CA, you need
to be careful to follow the laws related to the Assault Weapons Ban. In
general, if you build AR-15 style rifle with a pistol grip, you will need a
"bullet button". There are configurations that do not require a
bullet button. For more info on following CA Laws, Calguns.net has a very
helpful flowchart: www.calguns.net/caawid