Windage is adjusted using the knob on the right rear of the carrying handle/rear sight mount. There are two elevation adjustments. For the purpose of zeroing the weapon in, you would raise or lower the front sight post as needed. The front sight base is marked with an arrow and the word "UP" - this refers to which direction you would need to adjust it to bring the strike of the round up - it actually lowers the height of the front sight post.
100-300 USD or so
Contact the maker for a set of instructions.
No.
Look through your iron sights, or plastic sights, or whatever.
Check w/ Browning, but I think you are correct- BOSS will interfere with iron sights.
most of them were iron sights, very primitive v notch or battle sights
The sights.
1. Using a sandbag, set up your rifle so that it doesn't move around much.2. Aim the air rifle at a target using the iron sights.3. Adjust the windage and elevation of the scope until it is pointing at the target while the iron sights are pointing at the same target.4. Try it out, see what happens. Fire three shot groups and adjust based on the center of this group.
Best to ask a gunsmith for assistance
Wolfenstein 3D
No. Iron sights or peep sights (aka aperature sights) are the only type allowed for the merit badge.
In AIT you'll probably only use iron sights, which you need to get the hang of before you move to reflex sights and optics.