Sounds like the OP needs lessons in tabletop gunsmithing.
Always take them completely apart and polish the innards.
(Go ahead...bring your Mommy into the discussion.)
There is NO EXCUSE for razor sharp edges on the ejection port and any new rifle should cycle correctly, feed, fire, extract, eject, out of the box. When they don't, you can be sure it was not test fired at the factory and the manufacturer has zip for quality control/inspection, relying on clowns like you instead to finish the job they started..
