It's worth saying I've had various issues over the years with p-mags on both my colt m16a2 and a colt 6520. Mostly issues with them dropping free. I've also seen the issues with lowers from kac, lmt, mega, stag, bcm, etc.
I haven't had issues with my bcm lowers personally with the newer p-mags I've tried but I generally see it being more of an issue with the mags. Personally I mostly end up using aluminium mags for everything at this point. When shooting with friends or using other guns(scar, fs2000, etc) that don't like a lot of p-mags its easier. I don't care to sit there and check every mag to make sure its safe with all of the guns.
That being said bcm should look at modifying their lowers. The problem isn't just with them though.
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