Ding! Ding! Ding!
DJ 28 you are the winner.
I soaked it in Kerosene for 3 days. No change even with some light tapping.
I know three days isn't much so I was going to put it back in it's bath.
I was reading through this thread and saw the idea of boiling it. That made sense. It could liquify the old grease/oil.
So i put it in a pan of boiling water for about 5 minutes.
Took it out with a tongs and let it cool on a cloth.
Tapped it a few times and then.....
.....tried to move the slide and she went!
I would guess the kero and tapping helped loosen things up but the boiling water did the trick.
I have a shooter!!!