No they didn't come with pillars. I wouldn't change the box/ mag. Putting in the 223 version shortens the usable cartridge length, which is backwards from what you want with heavy bullets. A word of caution about that twist. Using light weight and lightly jacket varmint bullets will destroy them. Something like a Varmint Nightmare or TNT has an RPM limit around 240,000RPM, and most heavily jacket stuff like a Vmax or Blitzking are 290-320,000.
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