CA870 Mods

I just bought the CA870 Sworn off pump action shotgun. I shot it and I was a bit unsatisfied with the amount of power it has and I have some problems with pumping it.

When I pump it, no rounds actually go into the gun. I have to cock it upside down which is really annoying. I can’t fully load the magazine either, when I do, the gels end up just shooting out everywhere when I’m not even touching it.

Are there any mods I can do to add more power behind the gels, or to make them hit my target more accurately? And is there anywhere I can look for higher performance parts?

Any advice appreciated, thanks.