My experience with two rear sights on a changeable rear sight

 For a changeable rear sight. which can be changed almost instantly. 

Personal.

Rear sight which is rectangle with a small rectangle groove, and round and | on the front.

-I use this one with normal light.

-Better accuracy maybe.

Round rear sight, quit big. And a round front sight, with a |

-I use this one with lower amounts of light.

-Easier to aim and faster. More to see, and more light comes trough.

Learning about firearms 2 Diagrams and parts

 Searching firearm diagrams and firearm parts.

Handgun diagrams

Submachine gun diagrams

Assault rifle diagrams

Sniper diagrams

Anti material rifle diagrams

And shotgun diagrams

And more.

Learning about firearms - Firearm photos

Learning about firearms - Firearm photos

Watching photo's of firearms. And also zooming in.

Also watching the different places where the magazine releases are and the safety, semi automatic and or automatic firing slides if present. And or the slide release for example.

And more.

And also watching accessoires.

More advanced reloading

Without firing shots, reloading only.

Reloading while looking at the gun and the magazine.
Blindfolded reloading.
Reloading while walking and looking at the gun and the magazine
Reloading while walking and only looking at the gun or not looking at the gun and the magazine
Reloading while running and while looking at the gun and the magazine.
Reloading while running  and only looking at the gun or not looking at the gun and the magazine.
Reloading while running very fast  and only looking at the gun or not looking at the gun and the magazine.

And also increase the reloading speed with each of the above.

By Jeffrey Koelewijn

Update: Doing speed reloads and tactical reloads like this.

Update: Reloading while kneeled. Reloading from cover. Reloading while laying on the ground.