Heres how to check your ejection on any CZ, remove the magazine......place a fired case that was used in your rifle in the chamber then extract slowly, if the extractor and holder drop the fired case thats your problem, to correct this file a small flat on the tip of the holder where it contacts the case, go slow only a few storkes at a time, you only need a tiny flat spot to hold the case in place so it can get to the ejector post, then re-check as stated earlier.