Pump Action rifle with Attached Attachable Shot gun

It's not bad, but here is some advice. The "slider thingy" is called a pump, "The things that the slider thingy slides on" is the pump guide, the "Jammer" is called a ram, and that isn't a clip, that would be a regular mag. I just think you should know the correct terminology.

As for the gun, I like the pump. It can be hard to make a good pump. The main thing I would change on this gun if I were you would be the trigger. Be innovative and find a way to put the trigger by the handle.

nice!