http://www.gunsinternational.com/B-Searcy-470-NE-BLE-PH-Left-Handed.cfm?gun_id=100086392

I ran across a left handed Searcy .470 for $11,500. I checked the Searcy website and he's asking $18,000 for a new double. Sounds like a pretty good deal. Anyone know what is meant by "drops 1 3/4" and 3" from sight plane?