I picked up a couple of C Products 6.5 Grendel 10 round magazines for my build, they look and feel exactly like the ASC mags, the primary reason I got the C Products is because I caught them on sale under $10, I plan on grabbing a couple ASC 10 rounders and one of each brands 25 rounders to see which brand runs the best in my gun, I’m hoping they all work though lol