Idea for a Knex retractable sight
Ok, I had an idea where There would be this gun. The sights are hidden in the top of the gun, but can be exposed by removing a rod from the assembly. The sights would go on top of the barrel, would be powered by springs, and have a stop.
The gun would look like it had no sights, but the sights would pop up when you removed a bolt is the idea.
Unfortunately, to make such a gun, It would require a lot of parts, and the gun would be very big, but I'm just throwing the idea out there.......