How do i make a BB gun fire plastic bbs?

Hi, i have a Daisy Grizzly bb gun that fires metal bb s and pellets. i added a really good sniper scope and i tried to put a plastic bb to fire but it got stuck and was a huge hle to take out. I was wondering if i could do anything to make this gun fire plastic bbs, this sniper would be a huge et in my air soft wars, thank you.