Properly seasoned some ash is rock hard. It varies. I use it for tool handles as we have no hickory around here. I personally wouldn’t want to stock a gun with it because of the prominent growth rings and how easily it splits, but I’ve seen some striking looking guns made of it.
I’ve made firewood of dead ash trees and it’s not been as solid as trees cut green then seasoned. The limbs on dead ash are very brittle. Many here avoid taking down dead ash, depending on various factors, for that reason.