I don't use promags for anything.
Get some mecgars. Mecgar makes the oem sig mags ruger mags berreta mags colt mags, pretty much every major gun maker uses mecgar to produce their oem mags.
Promag is pretty much junk in my opinion.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...