Hey CGN, we have been having a lot of inquiries regarding these 10 round pistol magazines lately. We have them available, and they are a legal way to hold 10 rounds of 5.56/.223 into your semi-auto rifles. They can be found on our website with the links provided below. Cheers!
-Ryan
Mission First Tactical Lar-15 Polymer Magazine $24.99 ***SOLD OUT***
C-Products Defense Lar-15 Metal Magazine $29.99