I have a bunch of "P" mags, in 5.56 have never used them, they are still in the plastic bags, dark earth color?
I bought them because you can never have too much ammo or mags. I think 10 or 15 of them.
I got them on sale when they moved out of commie country, they were real cheap.
I used the OK industries mags on the PD plus in the guard and on my own, never had a problem with them.