only if your making a billet--LOL
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.
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!