0.75KG rifle project Live fire test

Went to a fun carnival style range for live fire testing. 300 rounds thru the gun with maybe 30 failure to ejects - I started lubing up the rounds before I loaded the magazine and that sorted the issue. Might be a barrel break in issue and it did not happen after the first 150 rounds. Best tool is a 1/4 inch open ended box wrench to pull the partially ejected shells.