A commercial grade broach to finish a rough-milled AR mag well will set you back very serious cash.
For onesies and twosies I suggest using a metal shaper machine or a beefy die filer to finish the mag well. A CNC wire EDM would also cut it for the big spenders.
VD in AZ
hell--where did cav-arms plastic lower machinery go?
those wern't too bad for nylon lowers--
if they had those machines running they could make a $1,000,000 worth a week!
Ummm...wow... and I looked cross eyed at a dealer at the last fun show asking $200 for a stripped lower.
"What country can preserve its liberties if its rulers are not warned from time to time that their people preserve the spirit of resistance?" -Thomas Jefferson-
"Our rights come from our humanity and may not be legislated away -- not by a vote of Congress, not by the consensus of our neighbors, not even by agreement of all Americans but one." Judge Andrew P. Napolitano
are they platinum plated or something?
I've got four sequential Essential Arms ones.
gold-plated super duper goobertonium i'll bet made on the forges of certified virgins , blessed by the AR guru in the sky--
NNNNA ! i think i'll bend one out of sheet-metal, make a lower for $20---LOL!