Is it ejector or extractor? Yes, the trigger costs a ton. Unless the gun is has very special engraving, the gun underneath is $800-$1000 gun with custom wood and a miller single trigger. If that's exactly what you want in a 20g, then have at it!

FYI, I'm a very big fan of old Mirokus. If/when I find an un-upgraded version of the gun you're looking at, I'd pay the $1000.