Quote Josh Small (ovation comment)
"I dont have grit but can i give them egg shell"
Crushed egg shells will help with their calcium levels but will break down/dissolve in the acidic conditions in their digestive tract I believe, so not suitable as grit to grind down the grains you are...
Do they have access to grit? All of those feeds need grit to break them down. I would also point out that they will not be getting enough protein unless you are also supplementing their diet with meat, fish and/or insects as well.
In order to produce eggs, they need a minimum of 16% protein...