If I'm not mistaken, the 24/7 mags will fit (just won't be flush or pretty) for range time or HD its an option. I know of no factory high cap mags though. If someone came out with some, they'd probably make some decent money. As for where to find extra OEM mags, I can't find any in stores anywhere. All mags seem to be sold out in my area... First these hoarders take all the ammo and now they all of our magazines! Lol
CreekFisher