1. Is this shotgun actually a Mossberg or some subsidiary? I can't find it at Mossberg.com, but may just be blind. 2. If a Mossberg, is there a detailed review in this forum? 3. What is the model number for the gun? 4. Those with this or a similar O/U, has anyone added/changed sights and if so, to what/why/how - to use for trap/skeet shooting?