Glad you're happy with the mags.
As for the Howa Mini Action, we do have one supplier who carries them but not for $400. That is a lot less than our cost. I did a little searching and couldn't find any for near that price. The models we have listed in .223 would be the HMA30203 and HMA30202... either one would be $574.99. There is also the HMP30203 and HMP30202 for $654.99
If there is a different model that I'm missing, please let me know and we will do our best to get you a good price in it.