Algodoo

This scene has a lot of issues!

First off, the green box reads "To fire, press B". It should read "To fire, press Enter".

Next, I tried loading and firing a number of times and I cannot get it to fire. Each time when I remove the spent cartridge case, the bullet just floats out of the breech right in front of the case!

Just for your information: That "tube thingy" you refer to is the bolt, and what you call the "bullet" is actually the cartridge. The part of the cartridge which is the projectile is called a bullet. People who know little to nothing about guns usually call the cartridge a "bullet".

If you can get the gun to fire, then maybe we can work on fixing the scoring system.

Honestly that's not very surprising bcause I've noticed a lot of my scenes won't work on other people's computers, but I've never had any issues like yours. The only reason I can think of why this happens is the bullets collideSet doesn't get changed and the attraction does nothing? To check it just select the bullet (or actually the box it's glued to, the bullet itself is just eye candy) and then fire it, and see if it's collideset gets changed.
But could you like, post a video of what it does? Cause I want to try to fix this cause I like this gun...

And also it says press B to fire because you have to do that in order to open the bolt and put the cartridge in, then you press enter