Rimfire Central Firearm Forum banner

Help!!!!! Failure to Eject MKIII512

307 2
I recently received my MKIII512 back from Clark Guns. I had a trigger mod done. While shooting various ammos, I had problems with the spent shells ejecting. I have only put about 200-300 rounds through the gun. Is this something that will fix itself as the gun "breaks in."? What is causing this, how do I fix it?