I&#x27;m not familiar with guns - what&#x27;s a sear?<p>Without knowing that, I&#x27;m gonna go ahead and make a comment that may not make sense: I think the idea is that it shouldn&#x27;t be <i>trivially</i> simple to convert a semi-automatic rifle into an automatic rifle. E.g., it can&#x27;t be done by putting a paperclip into some part of the mechanism, or slightly filing down a metal part.<p>If getting a full auto sear is a non-trivial process (which it seems to be) and making one from scratch isn&#x27;t trivial either, then gun manufacturers seem to have gone to reasonable lengths to prevent their guns from being converted to full auto.