Never buy Pro Mag. They are probably the worst magazines made.
Cheaper Than Dirt gave me a full refund no return needed. Now to buy a Ruger factory mag.
Swore off ProMag a decade ago.
They were junk in the 1980's and they are junk now. I don't know how they stay in business.
Pro mags are excellent mags for their intended purpose, practicing malfunction drills.
the Ruger extended 7 round mags are awesome.