Just spoke with Hawkins about their bottom metal. I ordered the CDG SA in 223. So for 223 Hawkins recommends the longer AW latch which only comes on their M5 bottom metal not the hunter version. Since I plan on a 6.5cm barrel in the future and aw mags are available for 6.5cm and Hawkins says use the aw latch for 223 aics mags this is a win win. If you want to use their hunter metal with flush mags they have a 5 rnd 223 which has the shelf for the latch situated to hold the mag higher in the well so basically a custom magazine. But the hunter metal will not take aw mags, it will take aics. I tried calling a few times and was getting there answering machine all of a sudden my phone rings and its Hawkins calling me......pretty awesome service.