Is there a breech plug tool to remove the breech?
One is shipped with every rifle.
Also is it just a primer gun, no disc or plastic thing?
It can is FPJ, 11, musket caps, depending on the priming options it was shipped.
Is it compatiable with BH209?
Not with my face behind it.
So with what I said is it worth 100?
A bare gun, in good shape without any accoutrements is worth that. Less in the condition you described.
If I need a breech plug tool were do I get one? Knights website doesn't show one.
There are hex head and slotted breeches (my new Bighorn is hex head). Knight combo tool is what you need.
Knight carries both, so does Amazon and others. They make a longer version (9.5") to clear scopes. Call Knight first to confirm your needs (hex or slotted).
http://www.knightrifles.com/combo-tools/
Do you replace that everytime you shoot? And looking at it I assume that BH209 wont work. Is that right?
I dunno; I don't use either.