It blows my mind how uniformly bad almost every ProMag product is. It's almost as if they intend to make unreliable products (this goes for both their steel and polymer magazines, regardless of host firearm).
I still laugh about what happened at this past NRA convention. Pro Mag was handing out bags, and I told the guys with me "If their bags are as bad as their magazines, I'd be better off just holding the stuff" and got a different bag from another vendor.
Sure enough, before we left the building the handle of one of my buddies' Pro Mag bags broke. Even their promotional gear is garbage.