HOW DOES RARE BREED TRIGGER WORK NO FURTHER A MYSTERY

Not sure what bolt bounce is as I am not knowledgeable with total-autos and haven't shot a person.  Having said that, in addition to different buffer it looks like I would need to mess Using the gas tube for getting it to operate proper if encountering an issue.  That straightforward to do or does it just take any Particular gear?This was a Stag