Exactly what it sounds like. It's the small peg at the front, and the small groove at the rear of the barrel that you line up on the target to get the bullet to hit home.
Iron sights are the most common an are sometimes interchangeable.
The sights.
Aiming.
No.
the process of lining up a firearm's rear and front sights
Check w/ Browning, but I think you are correct- BOSS will interfere with iron sights.
The type of firearm sight that is simple, inexpensive, and standard on most handguns is the iron sight. Iron sights typically consist of a front post and a rear notch or aperture, allowing for easy alignment and aiming. They are durable, require no batteries, and are widely used due to their effectiveness and low cost.
Look through your iron sights, or plastic sights, or whatever.
most of them were iron sights, very primitive v notch or battle sights
There are several. You can attach laser sights, silencers, flashlights.
Wolfenstein 3D
No. Iron sights or peep sights (aka aperature sights) are the only type allowed for the merit badge.