I know I don't shoot much compared to most people here, and I get to shoot rifles even less. That said, I have had significantly better success with PMags than Brownells magazines. As in, somewhere around 5 or 6 thousand rounds through two 6920's with zero malfunctions with PMags and several (at least seven) B-mags that caused failures to feed when brand spanking new. One Brownells magazine fed the first round correctly, malfunctioned on the second, and when I pulled it out of the rifle the partially fed cartridge twisted one of the feed lips. Lifetime of the magazine: one round. Great....
I do admit that the B-mags that appeared to be functional during initial testing just keep on working very reliably so far. And I do admit my round count is extremely low compared to most people here. But such a distinct experience in magazine reliability between the two brands is kind of difficult to just shrug off. I would recommend, if the situation is such that availability of magazines in the future can't be assured, to pay for current production gen 3 PMags.