For years the ASC stainless 223/556 mags were what the 204R AR shooters recommended. One of the reasons I went with a 20p build. I didn't need to buy any more mags/or keep them separate. I run 10 rd magpul for my 17 rem, another cartridge that AR builds can have feed issues. Rarely do I put more than 5 in. When it is very quiet and I need to be ultra quiet walking I will carry all the rds from my pack in a mag(s). No rattle, no ecaller, smalls inside extra mittens to reduce noise.