MDM,
I just removed some material from the front ( bullet tip ) area of the mag.
The accurate .223 mag has a exterior metal housing with a full size interior plastic sleeve.
The mags come apart by removing the floor plate and pulling out the plastic sleeve , then just remove some material in the front for added overall length.
If you do not have a Accurate .223 mag I can send you one of mine to inspect and to see if it feeds properly.
Just send it back please.
Let me know.
Bob